There's no reason a new Tomorrowland needs to focus on household gadgets and urban infrastructures that will be dated in 25 years. The theoretical physics of today is already weirder, wilder and more spectacular than most science fiction. From n-dimensional universes to wormholes, Tomorrowland could take you from the beginning of space-time to the end of the universe, from the unimaginably small to the inconceivably large; from a present when peak oil looms, to a future when fusion power has transformed civilization and new technologies have taken mankind to the stars.
If Disney were to convene a think tank of the top futurists in their fields (similar to the science and engineering advisers they hired in the 50s for the Man in Space series), Tomorrowland could become an amazing showcase of future reality -- and a land that captures the optimism of its founding theme.
All of which, of course, is moot -- the Disney corporate hierarchy is committed to Michael Eisner's mandate that "Disneyland is all about turning movies into rides." Like Buzz Lightyear, FNSV, Little Mermaid and Carsland, if it isn't in a Disney/Pixar/Marvel/Muppets/Cameron/Lucas/Spielberg flick, you aren't going see it in Tomorrowland.