The 'indirect compatibility' argument is the one that holds the most water in this entire thread. Yes, I know that the DSi has removed the GBA slot, and that many people have sold away their DS Lites as well as the original RSE/FRLG, but as far as Nintendo/Game Freak is concerned; you should have transferred your RSE Pokemon four years ago. If you started with DPPt and never played RSE then there are other ways to get Hoenn Pokemon. Outside of my in-game teams and legendary Pokemon, I just caught Hoenn Pokemon via PokeRadar and swarms anyway.
RBY and GSC had absolutely no connection with the modern games. Without being remade, these games would have been completely cut off from the rest of the series. This is not the case now. If RSE were compatible with RBY, would you have asked for RBY to be remade? Would there have been reason to?
Do we really have to constantly remake games each time there is a new handheld? I don't want to see the franchise go that way.
And RSE are my absolute favourite entries in the series. I would absolutely LOVE to play them again updated for a new system. But what then? DPPt remakes? BW remakes? When would they stop? How about NOW, when the Kanto/Johto storyline has been complete? When the only games that are completely incompatible have already been remade? Either they stop now, or stop later for some arbitary reason, angering the fans of whatever generation was supposed to be remade next.
That's my view on the matter.