Let's play a game: Save the Ancients!

[Dikatis]

When you actually find any evidence demonstrating the existence of these people who have supposedly claimed they want the mortals to die in favour of the Ancients, or literally anywhere their appearance or, uh, "perfection" (I mean, really?) has been shown to play into these arguments, let me know. In the mean time, I'll send you over some straw, you must be running low by now.

The present Etheirys and the World Unsundered are mutually exclusive. They cannot exist at the same time. As Cleretic said, if WoL were to somehow intervene and change the past, the Etheirys that they know, the one with all the people, places, and life they know and love, will be grandfather paradoxed out of existence as far as WoL could know. This also means all of the people of the Reflections would never exist too, such as the people of the First.

Even if we could create a branching timeline, that means we'd never be able to return to the main story's timeline just as G'raha could never return to his. And that timeline's Etheirys would be rendered a dead, barren wasteland by the Final Days without WoL bringing knowledge of Meteion back to the present.

Also, there are PLENTY of people on these forums who want all the reflections gone in favor of the Unsundered World and openly talk about their disappointment in us not letting the Ascians finish their plan.