I mean we're at the point where Sora barely mentions DISNEY worlds outside of that world and/or the main plot/characters in a DISNEY world (besides the "where's Riku/the King" one-liners from KH2 that are swiftly glossed over).
You don't understand how much I was hoping Sora would mention Halloween Town in Monstropolis or Ariel/Atlantica in The Caribbean.
I feel like this alone can be a whole other thread. What occurs in the Disney worlds actually has a lasting impact on Sora and the story itself. Also Disney characters getting referenced in other Disney worlds and original worlds. Or a certain object gets taken from one Disney world and ends up in another causing a chaotic imbalance in the world order, like maybe Triton's trident goes to Arendelle or Luke's lightsaber gets taken to Agrabah.
I would dare to go one step further and actually have a Disney character sneak on board the gummiship and travel with Sora, Donald, and Goofy to another Disney world and/or original world. Last time we had a Disney character (outside Donald, Goofy, and Mickey) as a party member in an original world was Beast in KH1. Vice versa actually have Sora discuss the main plot with the Disney characters in their worlds.