I don't believe that there will be another first-generation remake any time soon. Right now, we've got OR/AS coming up in a couple of months, and once that'd done, many are expecting to follow up on their pattern and start developing remakes for Diamond, Pearl, and Platinum.
Once DPPt remakes are finished, it will eventually lead us to remakes for Black and White, I feel, as well as Black 2 and White 2. Later, it would more likely be X and Y. Would I personally like to see something again for Red, Blue, and Green, though? Sure, why not? They were my favorites, and while I did experience them again with updated features and whatnot in FireRed and LeafGreen, it would be even more fun to play with X and Y style of graphics and mechanics.
What would be even better, in my opinion, is if they were to create remake Pokémon Yellow. I understand that it was made just to tie-in due to success of anime and so forth, but it shouldn't hurt to give it a shot once more.