I think with the old Millionaire should be kept, and be the next location for Superstar Television. With Disney owning Touchstone and the recenet successes it has, it could get quite a large draw. I mean if you had the big shows like more mature and dramatic shows Lost and Alias and more comedic shows like Scrubs or Desperate Housewives, plus the older Touchstone shows. Which remembering from a early 1990s WDW Vacation Planning video were Home Improvement, The Golden Girls, and some other show.
That or the could some kind of dark ride not based on a Pixar film....Maybe they can dig out some abandoned concepts from the Disney Decade for Hollywoodland that was supposed to be between Main Street U.S.A and Tomorrowland 2055.