I'm gonna vote to tear down the old Carousel building and put something new there. The last time we saw some major changes to the foundation of Tomorrowland was the addition of the Space Mountain complex in the 70s. Otherwise, the whole place is still operating out of the same ol' buildings that were there for the Hall of Chemistry and Adventures Through Inner Space.
Give WDI the chance to make something unique and distinctly futuristic for our time. The EMP building in Seattle and the Disney Concert Hall in downtown LA look more futuristic than any of the Tomorrowland structures at the moment.