There is a firm line drawn between the people who pull for one ending or another. Obviously, some believe that ending the flame is for the best and some believe that letting the flame roar back to life is what is best. The difference between the two sides is typically the ultimate question: "What does the kindling accomplish?" To take a stab at that question, we must look at what the flame is and what the act of kindling DOES.
Three Lord Souls came from the flame; we won't count the Dark Soul, as we don't know where that actually came from. Those three souls went to the Lord of Sunlight, the First of the Dead, and the Witch of the Flame. We know that the flame created disparity according to the intro. Specifically, the intro states it created the differences between light/dark, life/death, and hot/cold. But why would it state those specific differences?
Let's look at the powers of the lords, shall we? Gwyn, the Lord of Sunlight, fights with the power of the sun - lightning. Before going to link the flame, he ruled over the kingdom of Anor (Sunny) Londo. His first two children followed in the footsteps of the God of the Sun, with his daughter succeeding him as the Queen of Sunlight after he linked the flame.
Nito, the First of the Dead, has great powers over death. He rules over the catacombs, an underground catacomb filled with the remains of the dead. He strikes with poison and miasma - death incarnate; his followers can animate the bones of the dead. His lord soul says that he "administers the death of all manner of beings." The gods in the game don't have the ultimate power that the term "god" brings to mind, but Nito seems to be the utmost authority on death.
The Witch of Izalith ruled over the underground realm of Izalith. The queen of flame sorceries, she fights with roaring flames. It is her who tried to create the Second Flame and, though she failed, it is her daughter who survived the disaster and taught humanity pyromancy. Whether it existed as it does now before the disaster or not, Lost Izalith is a molten wasteland, filled with magma and slag.
Gwyn obtained a Lord Soul and became the Lord of Light. Nito plucked out a Lord Soul and became the Lord of Death. The Witch grabbed a Lord Soul and became the Lord of Heat. It's typically assumed, though not stated, that they had these powers before they found the Lord Souls.
But what if they didn't? We know the flame "created," in one way or another, light/dark, life/death, and hot/cold. We also see that The Three Lords that took souls from the flame gained power over life, death, and heat. We know that they had the Lord Souls before they fought the dragons, but we don't know if they had their powers before that, so what if their powers came FROM the Lord Souls?
The flame created light/dark, life/death, and hot/cold; three beings took souls from the flame and gained, respective, power over light, death, and heat. It seems likely that this would transfer that power from the flame to the Lord possessing that aspect of "The One Lord Soul."
So then what happens when the Lord who possesses that Lord Soul experiences something like Death?
The intro specifies that the undead curse has started (back?) up, and that the sun has (mostly? somewhat?) ceased to rise; the lines between life/death and light/dark are being blurred, if not outright wiped away. We don't have much to on for temperature; it's possible that the world has also gotten significantly colder, but there is no evidence for this. So why would two lord souls fade, but one remain?
Gwyn divided his lord soul between his servants, his kin, and several of his allies, and then burned as a cinder for the flame. According to Nito's lord soul, much of his power has been dissipated in his role as the Reaper, and he has gone dormant; likely as a way to preserve what little power he has left.
But the Witch's downfall isn't because her power faded. To the contrary, her power raged out of control when she tried to recreate the flame. If you look at the descriptions of the Lord Souls, something interesting can be noticed: of all the lord souls, al of them say they "satiate the lordvessel." Except, that is, for the Witch's, which says that it "more than satiates the lordvessel." But while that doesn't explain why her power hasn't faded, another part of her experience does: after all, she has merged with a great archtree, a living part of the earth, and likely have some kind of connection with the flame as we see an archtree right before the flame in the intro.
So the witch's soul hasn't faded because it has connected with an archtree, which is connected to the flame. So the lord souls don't fade when connected to the flame, and are likely actually "healed." So the issue then becomes how to restore the other lord souls by linking them with the flame.
You bring the lord souls to the lord vessel to open up the Kiln. But is it really the lord souls themselves you place in the lordvessel? At the very least you absorb part of their souls; after all, you do gain some souls (a massive amount) from killing the lords.
So you place part of the lord souls in the vessel, which, as we see in the Dark ending, burns up while you fight Gwyn. That leaves only the parts of the lord souls that you absorb while obtaining them.
Which leaves one easy method to return them to the flame. A selfless sacrifice to reinvigorate death and light.
Three Lord Souls came from the flame; we won't count the Dark Soul, as we don't know where that actually came from. Those three souls went to the Lord of Sunlight, the First of the Dead, and the Witch of the Flame. We know that the flame created disparity according to the intro. Specifically, the intro states it created the differences between light/dark, life/death, and hot/cold. But why would it state those specific differences?
Let's look at the powers of the lords, shall we? Gwyn, the Lord of Sunlight, fights with the power of the sun - lightning. Before going to link the flame, he ruled over the kingdom of Anor (Sunny) Londo. His first two children followed in the footsteps of the God of the Sun, with his daughter succeeding him as the Queen of Sunlight after he linked the flame.
Nito, the First of the Dead, has great powers over death. He rules over the catacombs, an underground catacomb filled with the remains of the dead. He strikes with poison and miasma - death incarnate; his followers can animate the bones of the dead. His lord soul says that he "administers the death of all manner of beings." The gods in the game don't have the ultimate power that the term "god" brings to mind, but Nito seems to be the utmost authority on death.
The Witch of Izalith ruled over the underground realm of Izalith. The queen of flame sorceries, she fights with roaring flames. It is her who tried to create the Second Flame and, though she failed, it is her daughter who survived the disaster and taught humanity pyromancy. Whether it existed as it does now before the disaster or not, Lost Izalith is a molten wasteland, filled with magma and slag.
Gwyn obtained a Lord Soul and became the Lord of Light. Nito plucked out a Lord Soul and became the Lord of Death. The Witch grabbed a Lord Soul and became the Lord of Heat. It's typically assumed, though not stated, that they had these powers before they found the Lord Souls.
But what if they didn't? We know the flame "created," in one way or another, light/dark, life/death, and hot/cold. We also see that The Three Lords that took souls from the flame gained power over life, death, and heat. We know that they had the Lord Souls before they fought the dragons, but we don't know if they had their powers before that, so what if their powers came FROM the Lord Souls?
The flame created light/dark, life/death, and hot/cold; three beings took souls from the flame and gained, respective, power over light, death, and heat. It seems likely that this would transfer that power from the flame to the Lord possessing that aspect of "The One Lord Soul."
So then what happens when the Lord who possesses that Lord Soul experiences something like Death?
The intro specifies that the undead curse has started (back?) up, and that the sun has (mostly? somewhat?) ceased to rise; the lines between life/death and light/dark are being blurred, if not outright wiped away. We don't have much to on for temperature; it's possible that the world has also gotten significantly colder, but there is no evidence for this. So why would two lord souls fade, but one remain?
Gwyn divided his lord soul between his servants, his kin, and several of his allies, and then burned as a cinder for the flame. According to Nito's lord soul, much of his power has been dissipated in his role as the Reaper, and he has gone dormant; likely as a way to preserve what little power he has left.
But the Witch's downfall isn't because her power faded. To the contrary, her power raged out of control when she tried to recreate the flame. If you look at the descriptions of the Lord Souls, something interesting can be noticed: of all the lord souls, al of them say they "satiate the lordvessel." Except, that is, for the Witch's, which says that it "more than satiates the lordvessel." But while that doesn't explain why her power hasn't faded, another part of her experience does: after all, she has merged with a great archtree, a living part of the earth, and likely have some kind of connection with the flame as we see an archtree right before the flame in the intro.
So the witch's soul hasn't faded because it has connected with an archtree, which is connected to the flame. So the lord souls don't fade when connected to the flame, and are likely actually "healed." So the issue then becomes how to restore the other lord souls by linking them with the flame.
You bring the lord souls to the lord vessel to open up the Kiln. But is it really the lord souls themselves you place in the lordvessel? At the very least you absorb part of their souls; after all, you do gain some souls (a massive amount) from killing the lords.
So you place part of the lord souls in the vessel, which, as we see in the Dark ending, burns up while you fight Gwyn. That leaves only the parts of the lord souls that you absorb while obtaining them.
Which leaves one easy method to return them to the flame. A selfless sacrifice to reinvigorate death and light.