Let's face it, Rowling didn't want to work with Disney anyway. She would have made a mess in her pants if Disney buckled to her outrageous demands.
Completly untrue.
Rowling was very much willing to work with Disney but overtime became frustrated with Disney's mandate to build everything on the cheap plus Eisner kept sticking his nose in saying that instead of putting Potter in the parks it should be used as "indoor entertainment centers" in countries like Malasyia and Japan.
There is even a rumor that Eisner basically told Rowling Disney would pay her for the theme park rights simply to sit on them just to prevent the competition from getting them!
BTW, Universal and Disney for a time were also actively lobbying the Tolkien estate for the theme park rights to LOTR. Disney stoped after they acquired the Narnia franchise and Pirates of the Caribbean turned out to be a hit. Not sure what happeend between Universal and Tolkien Estate though. Maybe a LOTR attraction with walk around charecters will be Universal's next major project