The multiple version thing is kind of part of the appeal of the series to me. I always like going out and getting both then playing through one then the other - just sort of a thing for me. Usually whichever I beat first is the one that gets my main focus afterward, though.
But I could live without that. The Yellow / Crystal / Emerald / Platinum games are desperately needed, though - the third game in a set (or fifth for Emerald) is where they always fix all of the screw-ups, and Black & White have a ton, and basically build the template for what becomes the next game.
Err, forgot to mention, they need to drop this regional Pokedex crap. It just severely limits your choice of Pokemon, plus makes things needlessly repetitive when they don't need to be. Like Black & White having an Electric gym consisting entirely of Emolga, Blitzle, and Zebstrika.