If they want to give us a 3D Kanto, make it a side-region alongside Kalos. Pokemon K, anyone? c; We already have FRLG, I don't want another Kanto remake.
The problem with arguing this is, they already did it once with ORAS. Whatever they're making, they've had the most important parts planned and set in stone probably back when B2W2 was getting released. No matter how many regions they were going to give us this generation, they would have had all the geometry, textures, lighting and interactivity done for each one long before they ever hinted at its release.Please tone down the baseless speculation...
Also, for what it's worth: Remaking Kanto requires GameFreak to mold an entirely new region from scratch (although they have the layout figured out, modelling and texturing the region takes a lot of work). Any follow-up to the Kalos games could have more than 80 % recycled content from X and Y in it. You know, like all the other follow-up games out there.