Speaking of Xehanort’s motives, the concept of balancing light and dark needs some more detail.
While having a world focused more on light doesn’t initially seem like a bad idea, you soon begin to see that a light-only world turns into something more like the Destiny Islands — a haven from reality that can’t last forever. It’s like an Ursula Le Guin setting, lovely on the surface, with something lurking underneath.
In fact, ignoring the darkness led to Ansem’s original quest for knowledge and paved the way for Master Xehanort’s insatiable desire to know more. How correcting the balance between light and dark might affect the worlds is, of course, unclear — though it’s easy to guess that Master Xehanort’s methods probably aren’t the best ways to achieve this particular goal.
Since almost everyone, good and not-so-great, has undergone some form of trial and has had to face the darkness in themselves and others, it’s not very likely the world can go back to the way it was before.
All of the characters are more self-aware and work to incorporate balance in themselves and the world around them.
What are you hoping to see resolved in Kingdom Hearts 3? Let us know in the comments.