People have to realise the only reason this game is getting remade is because its so hard to transfer pokemon from gen 3 over to gen 6.
I can see them doing another Pokemon Blue/Red/Yellow at some point, because they, or there original remakes aren't on a DS cartridge. They are still on the Orginal Gameboy ones, meaning its very hard to get pokemon from that system onto the new ones.
The only reason they would remake Gen 2 and 4 now is to get them all up to date with the graphics and the new 3d models it's introduced, but i highly doubt it will happen, i think unless Gen 1 is remade again, this is going to be the last remake we see of any Pokemon games until we see a new cartridge that isn't compatible with any DS system.