A remake of Ruby and Sapphire would be cool, but in a way, I'm negative about the idea. Unless some new ideas came out of the works, I think the gameplay would feel pretty much like Diamond/Pearl/Platinum/SS/HG.
I remember when Sapphire and Ruby first came out - at the time I was still totally in love with my Crystal version (ah, to play a girl for the first time!) But R & S introduced full colored graphics, beautiful pixel art, double battles, contests, and many other, at the time, mind blowing features. But then with Diamond and Pearl, nothing seemed 'fresh' to me, other than the fact that there were dozens of new pokemon, which I didn't really even like. The new features that were included in the game didn't impress me much (now we have to make our pokemon dance in pokemon contests? Good grief)
Well anyways, if a remake of Sapphire and Ruby DOES come out of the works, I hope there's some fresh new features in the game that will make it worth buying.