Oh, there's absolutely no way Pokémon is the main land of Park 3. If Nintendo is fully moved there, I full expect it to be the flagship property, but Pokémon itself wouldn't be.
Oh, don't get me wrong. I'm a Zelda fanatic. It's by far my favorite game series of all time, and it could be the whole park and I'd be happy. But Zelda just isn't Harry Potter. It's not popular enough for that, as much as it pains me to say it. If it happens, I expect it to be no bigger than whatever Pokémon ends up getting, if anything.