But a lot of those aren't good video game settings. The Good Dinosaur isn't a good setting because there's minimal narrative thrust and character interaction that works within an ARPG. Finding Nemo/Dory well, everybody hates water levels. You're left with very few pickings at the carcass for world variance at this point. Which is why it makes sense to just move along using original worlds to anchor the narrative and plot structure while keeping the Disney worlds as the primary "Wow" worlds to include. Because if you're going to continue with this franchise you need to keep Disney as the primary driving force but at a point you just kinda run out of Disney stuff to romp through.
I get it, people go "MAHVEL" and shit but that would make for a crappy level. They don't mesh well, there's no synchronicity between the properties. Kingdom Hearts was designed around the Disney ANIMATED features. It's why the Pirates worlds are bad. It's why them turning it from a one off cool collaboration/crossover into a franchise came with risks, that's the risk.
We just had a thread for new world ideas. Still alot Disney ground to cover before they run out. Not to mention revisiting old worlds.