What if Azeroth gets destroyed in TLT?

First, let me preface this by saying I'm not a crazy person. I understand that WoW is a product made to generate revenue for a company. They are not likely to kill off their cash cow. I am simply musing on the possibility that Microsoft/Blizzard take a brave and bold step in a certain direction.

What if at the end of The Last Titan, we the champions of Azeroth just... lose?

What if Xalatath just wins and corrupts the universe? What if at the end of it, the skyborne arrive and realize they're too late for this reality and direct us to restart the cycle and have things happen in a different way?

This would funnel players from retail which will still remain supported with new m+ and pvp seasons but not get any new lore content, while WoW Forever becomes the new main lore continuity, progressing the story along similar yet different vectors (ex: Garrosh becoming an honorable leader of the Horde) and having events play out in a different way.

I am not talking about something that happens overnight but a continuous commitment by the game devs to grow the game, its gameplay systems, and lore over the course of decades. To tell the story in a new way which ultimately would lead to Azeroth's survival.