You are way over rating the popularity of TRON. It is virtually non-existent in most average ordinary people's minds. Doesn't mean they couldn't make a solid attraction with TRON as the theme, but that applies to virtually any film Disney has every made. TRON and Star Wars are not even remotely in the same stratosphere in terms of popularity. For the most part TRON gets a collective yawn from most people in terms of how passionate they are about the films, while STAR WARS is entrenched in American Culture. Again, not arguing which IP might fit better, but the argument definitely can't be to use TRON because its so popular, because it most definitely is not.