Well, I don’t think they’ll stop making new Pokémon unless and until they run out of money, which at the moment is looking unlikely to happen in the next few years. They do seem to be slowing down, with only 80-odd Pokemon in the Kalos generation (although, against that, Unova was the largest yet, and the only one to exceed Kanto in number of species). I suppose, that being the case, it’s conceivable that they will declare an end to the whole thing two or three generations hence at #1000, which would be a neat place to stop, but something tells me they won’t – new Pokémon are their way of giving the franchise new life every couple of years.
I’m actually really interested to see where Pokémon will be twenty, thirty or forty years from now. It’s only in the last century that it’s become possible for works of fiction to achieve anything like the degree of global cultural penetration that Pokémon has, so there is absolutely no historical precedent for how something like this will develop in the long term. I sincerely regret that I will never see how it’s remembered in a hundred years or so!
EDIT: Winterdhole suggests: “Maybe instead of creating new pokemon, they’d find ways to upgrade old ones? … or well instead of “upgrading”, perhaps find new evolutions to put forward? Or new ways of playing?”
Well, sure, but I think they do that anyway, don’t they? I mean… Mega Evolution. Pokémon Amie and Super Training. I don’t think they view that as a zero-sum thing.
Pokémaniacal 