I think when they get to a really high number of Pokemon, perhaps after Pokemon X and Y, they might move to a new time period, maybe in the past or future, where many current Pokemon either don’t exist yet, or have become extinct depending on the time, then release a new Gen, kind of like starting from scratch. What do you think about the idea?

Do I think they’ll do it, or would I like it if they did?

If there’s one thing I know about Game Freak, it’s that they like to stick with what they know will work.  I doubt they would abandon their setting lightly.  Not to say that it’s impossible; they seem to have been very consciously trying to confound our expectations during the last generation or two (and, of course, in a spin-off game anything goes), but I think it’s unlikely.

Anyway, I’m biased, naturally; I’m a history guy, so I would very much like to see a Pokémon game set in the past.  I have always felt that Pokémon is a game about discovery and exploration, and the fifth generation, particularly the second pair of games, seem at times to be going out of their way to imply that there’s really not that much left to discover.  Setting a game in the past would get away from all that.  I also think it could be a great deal of fun to work around all the modern conveniences we’re used to from the newer games.  Fewer Pokémon Centres in the past – maybe you have to help set them up?  No PC storage system – carrier Pidgey?  Most Pokéballs are going to be made from Apricorns – gotta find a time and place to cultivate them and create more effective strains. Medicine?  Probably going to rely a lot on herbs and berries.  There’s a lot you could do with a game like that.