I really doubt it would happen, but y'never know. Knowing nintendo, they'll probably attempt a 5th gen. and then the sequel to that, then the chances of them making a G/S/C remake is more likely. That is, if they do make a 5th gen. *Shudder* Nintendo and they're so called "New pokemon ideas"...
Chances are judging by what we have atm, they could either make it this gen, the next gen (if so, then the coding for Pokemon to come from 'Johto' in DPPt can still be used if the 5th gen allows for backwards compatibility), or not at all - to predict that they would make it in two generations has very little to support it, really. What happens is up to Nintendo and Game Freak and so forth, but there's nothing at all suggesting that they would do it then, even if it is (like anything, really) is possible. =/
As for a 5th gen... IMHO there will be a 5th gen, disregarding their 'new Pokemon ideas', as you refer to them (seemingly, you dislike them?). Like or dislike, these ideas made them millions and millions of sales, and as long as Pokemon still prints money, then more games will be made, simple as that. It's how the gaming industry works, and for one of the best-selling game franchises ever... well, unless Nintendo don't want to continue making millions (and they do want to), then we'll see a next gen, I'm pretty sure.
We need a remakes, there are no Pure Gameboy ways to get all jhoto pokemon.
It would not make sense to leave out jhoto,
1.Jhoto is what made everyone learn to like the world outside of Kanto
It did? For many of the current gamers, Hoenn, Kanto, or Sinnoh was their first region they experienced, as RSE/FR-LG/DPPt were their first games. It is one of the big four, yes, but it certainly did not make everyone like the world outside of Kanto. (Never mind the people who do know Johto and didn't like it either - not everything pleases everyone).
2. It has allot of nice pokemon
Again, subjective - down to opinion, really, and not a reason that I think would persuade Nintendo/Game Freak to remake GSC (such as 'it'll make you $$$!).
3Why have FR/LG/ DP/ RS/ but not GS remake? every other region is there in advance graphics, and all ready for import to DP, but thers no way to get jhoto starters without a wii, gamecube/ or AR
Better... of course, they could always decide to make new games rather than a GS remake, I suppose (this also goes for the vague possibility of new Wii games which is always possible), which would also make them money. Lacking of a straight-forward way to get certain Johto Pokemon in is something already noted though, and does seem to be very nicely done in such a way that a possible GS remake could fill in that hole, yes.
And it's 'Johto'. =P