Why would you want the same content you've already got rather than more new content? Especially when a lot of that content you've already got isn't that good. IMO the vast majority of gen 1 Pokemon designs are crap, so all of the gen 1 pandering Gamefreak has done lately has been pretty annoying to say the least.
Plus variety is nice. I can't think of any other game that re-uses the exact same enemies in every single entry and I certainly don't want any games like that, it'd be boring.
That doesn't answer my question. Wanting new content is good, of course, but why would you want the old content to just go away, when it accomplishes a fundamental part of the game? Why not build over the already existing frame instead of starting from scratch over and over again?
Pretty sure I already explained that, but it's not just "content". I like the Pokemon world more than I like the Pokemon games, I want it to be an interesting, varied world and I don't want that to be ruined just for the sake of quantity.
To compare it to our world, are Pigeons interesting? No, because they're everywhere. Pigeons are boring. Are Pandas interesting? Yeah, people love Pandas, they're exciting because they're only found in 1 place. That's what I want with Pokemon too. It's especially relevant when you take into account the geography of the Pokemon world. Kanto and Johto are literally right next to each other, you can walk from one to the other, so those two having a lot of overlap in terms of Pokemon species makes a lot of sense. However places that are distant from each other and are made to look exotic because of that should have minimal if any overlap. Going to new exciting exotic locations is interesting to me, that's what I want to do in the games. Going to those locations and just finding Pidgeys, Ponytas & Oddish all over the place takes away all of that excitement.