Orphalesion
Well-Known Member
Because it'd make a lot of money without too much work. Give it a different starter like Vulpix or Growlithe, add One Island, Two Island, and Three Island, add some more rideable pokémon, and some other feature like a photo club, and it'll sell at least like five million copies. Perhaps even more because Starter Vulpix and Starter Growlithe would be unique to those games. Johto would be far more work. 100 more pokémon, a whole new region to make in 3D, all new animations for a ton of stuff like the Ecruteak dancing studio, spawning of Lugia and Ho-Oh, Suicune running on water, etc, figuring out how to incorporate roamers, figuring out if there's anything possible they could do to fix that horrible level curve.
However there isn't really a Pokemon that is as "iconic" as Pikachu or Eevee in Gen 1. Sure Growlithe and Vulpix are fairly popular, but they don't have mascot status like Pikachu and Eevee and I doubt they'd sell as well. So I don't see a third version like that happening.
Personally I expect Let's Go Pikachu/Eevee 2 happening at some point.