Well, any ending wouldn't be "canon," but the inhabited area of Athas is very small, just a handful of city states. Enough for a single epic, war filled Adventure to complete the Revolution, and the war can be Battle Game appropriate.Absolutely. Or at least a 1-20 AP where they eliminate a single sorcerer-king and end slavery in that city-state.
But across the whole of Athas? That would drastically alter the setting. Something most fans wouldn’t like.
Seems more likely than an Eberron style book for Athas, givem how small and focused it is.