They won't because in fr/lg you could get the pokemon of g/s/c and in emerald you can get the johto starters by completing the national pokedex(if I am not wrong or complete something in the pokedex but still you could get them).They made fr and lg because the gameboy advance had no backwards compatibility with the gameboy color so nintendo had to do something in order for players to get all pokemon at that time.So they remaked red/blue into fr/lf and there you could get all pokemon from both kanto and johto and trade them with sapphire and ruby,so you could get all pokemon(on that time).If nintendo would have wanted to remake g/s/c then they would not have created pal park were you can import your pokemon from the gameboy advance games to d/p.So in conclusion it would be unnecessary to make a remake of g/s/c still they are my favorite pokemon games in the whole series.
