I posted a personal headcanon on the lore forum that, without Hydaelyn, the sundering will eventually correct itself. Much to my surprise, there's evidence to support this?

Quote Originally Posted by RyuDragnier View Post
Hydaelyn Sundered the world and Zodiark altered the aethercurrents...since Zodiark being gone currently has the Aethercurrents repairing themselves back into their original state (as shown by the FSH Studium questline), then Hydaelyn being gone means there's nothing keeping the shards separated anymore, they're going to combine.
This is potentially promising and probably the most hopeful I've been since the end of EW. Short of an AU, I love the idea that everything will 'right' itself eventually. I might even be able to find some forgiveness in my heart if this whole sundering mess turns out to be a blip in the history of Etheirys.