And big successful Disney properties like Moana or Zootopia will probably have the same level of restrictions as a Frozen and Tangled did. The same probably applies to Pixar in how they handled Toy Story and Monsters Inc.
I'm not sure what do you mean by that since the Pixar worlds were the ones that felt the most like the older games? The storylines are all after the original movies and didn't feel restricted by the developer at all, besides the no fighting the game characters part that is a theme throughout the entire game (even though we DID fight Dark Baymax, but not Randall unfortunately).
That being said, I don't think any of the core concepts are in danger or anything. Personally I'm pretty satisfied with how Twilight Town worked in 3 as a purely interaction-based world with no real fighting, I just wish they did more with it throughout the game, like new characters showing up or more sidequests to do, like a young man in love wanting flowers to surprise his wife and then we could grab then in the garden in Olympus or the forest in Corona, or a mom wanting to surprise her kid with a birthday gift which we could grab from Toy World, etc.
Gameplay-wise I just want to interact more with what we have.. Almost all worlds have sort of a hub area but we can't really DO anything there. Corona Kingdom could have had subquests and more interactions to do there with how big they made the city..
Although I love the original worlds, what I really miss isn't the original aspect of them per-se, but the fact that they had stuff to do throughout the entire game with more things unlocking as we get new abilities or progress through the story. 3 had giant worlds but they still managed to feel empty because once you are done with the story they are pretty much done and you don't really need to return later neither, you can finish the entire worlds in pretty much one go if you want to.
I'm okay with Disney taking the frontline again as long as the worlds have stuff to do AFTER the story ends. Give me sidequests, give me secret areas to explore with harder monsters, secret bosses, etc. I don't see any reason why those should be locked to original-worlds only when we have an abundance of interesting scenarios and locations to work with.