They have used the void as a plot hook in so many different areas of the game it will be hard to tie them all together. I assume it will leave off similar to how we 'fixed' the first. Everything will get better in time but it will take a bazillion years and we won't see it in game.

We could just leave a portal open but have it pointed at a magical blender. Void beings come through and die here so that their aether enters our reincarnation cycle instead of being stuck in theirs.