Did they have to destroy the Old World? Logically yes. Other than Valten and the Warrior Priests the humans were fucked. I played Mark of Chaos and automatically thought they humanity was out of its league. Same thing with Vermintide. Warhammer had the balls to do what 40k is impotent to do: progress the story. Chaos can't be "trying" and the Empire "surviving" perpetually. Eventually someone's endgame has to succeed. Logically it wasn't going to be humanity, elfs, or dwarves. Though I understand some may want to maintain the status quo, it was unsustainable. Also unlike 40k that has an entire galaxy, chaos can invade only so many times before they win. I like the premise of this an I think it's ambitious. Lot of imagination in creating these realms, gods, and warriors.