[X] The future. The one place you cannot seem to reach, throne or no throne. Has Zuko ever wondered what it'll be like? No, not whether the mantle is heavy enough to cramp the shoulders, or what his first command as Fire Lord could be—just about the shape of the Sun's path through the sky, the day after Sozin's Comet, and what the world will have become in the face of that light. What does he see? What do you?
Let him already say where he wants to lead the Fire Nation by his actions, rather than postponing this answer for later by waving away phrases:
"The war must end because everyone is suffering from it."
War was originally started because of the Fire Nation's hunger and lack of arable land. War solved these problems, albeit in such a brutal way as mass deaths on the front lines.
Now the problem is solved, but what's next? Sprinkle ourselves with ashes and give up all the sacrifices that have been made so far? What kind of foolishness is that?
No, the idea of burning a city is stupid, but it's about peace to settle the land and get rid of the wounds, not actually giving up everything. So he'll devalue all the sacrifices that have been made.