Not that it would happen but I do wonder how much money Disney would owe Cameron if they up and decided to go a different route from a galaxy far, far away. I am still not sure that the theme would fit DAK, although Endor and Tatooine both give a great outdoor setting. Just not Ewoks. I'm sorry but I truly hated them. Jedi would have been fine without amping up the cute factor. The Family Guy's take on that movie is so funny where they joke about how the Ewoks with slings can defeat armored troopers with laser guns.
To be sure, it is probably useless conjecture. Disney is probably too far along with Avatar to just up and drop it. Investment in design alone is probably a good chunk of money.