These are just some of the movies they haven't tapped yet for content, going all the way back to the beginning, and just sticking to ones with parks representation (since this IS supposed to be a parks-based game, despite the idiotic presence of Ice Age):
- Fantasia
- Adventures of Ichabod & Mr. Toad
- Swiss Family Robinson
- Mary Poppins
- Tron
- Honey, I Shrunk the Kids
- A Goofy Movie
- Tarzan
- Dinosaur
- The Country Bears
- Cars
- Monsters University (other than the characters from the original movie, obviously)
- Incredibles 2 (ditto)
- Jungle Cruise
- Chip 'n Dale: Rescue Rangers (also, could extend this to the entire Disney Afternoon universe)
- Elemental
- Wish
- Inside Out 2
On top of that, they haven't even tapped the Marvel Cinematic Universe (thought I don't know if Gameloft's contracts allow for that -- though they do have Star Wars in the game).
So there's PLENTY of content to keep them going for years, without even accounting for expanding existing collections (they still owe us the second wave of Hocus Pocus) or new movies that will come out (Moana 2, Frozen 3, Toy Story 5, Cars 4, Monsters Retirement Home, Ralph Breaks AI, Inside Out 3, Frozen 4, Toy Story 6).
That said, the game is approaching it's 10th anniversary, which would certainly be an opportunity for Gameloft to sunset it if the company didn't believe it was bringing in enough money to maintain it.