A huge thing to remember is that the previous WoD never stopped being on Hydaelyn's side or ever supported Zodiark. The Ascians have always been implied to be the Echo-users who are allied with Zodiark. The Warriors (whether of Light or Darkness) have always been allied with Hydaelyn. For that to change would require one hell of a set-up that doesn't have any foreshadowing.

Until 4.5 Part one hits, the WoL siding with Zodiark to become the WoD is at the bottom of my predection list.