You know I'd love it but I have zero expectations of a proper world revamp with a newly crafted world. I do however think that a world UPDATE is possible. They have created buildings that can be batched into the game to replace the old ones; it is entirely possible the same holds true for other major objects like trees. What needs to be done by hand is still important; applying new textures and placing doodads (though they have clusters built to speed the process). And beyond that, not a single race so far crosses zone borders. The ones in Kalimdor also weirdly all seem very specific to a single zone (and I say weird because most of those zones are so small so I wonder how much of a race you can get there). That would mean zone borders would likely stay (which is sad, I would so much prefer merging zones and eliminating certain borders) but they can do that much faster now by using premade blocks of cliffs.