I don't see kanto getting another remake, like, ever.
Probably not.
It's been in 4 generations now.
The setting of Red/Blue/Green/Yellow (Gen1), the end-game area of Gold/Silver/Crystal (Gen2), the setting of FireRed/LeafGreen (Gen3), the end-game area of HeartGold/SoulSilver (Gen4).
If we ever see Kanto again, then it will be in spin-off games, or as an end-game location in another series.
They're not likely to re-make Red/Blue/Green/Yellow any time soon.
Might be interesting to see it in 3D, but I don't think it would get quite as many sales as expected. Who wouldn't feel atleast a little bit cheated at the idea of having payed for the same thing 4-5 times?