I'm sorry if someone already posted this.. But I have an idea.. Re-theme the entire land to "Discoveryland" form Disneyland Paris. Discoveryland was themed in such a unique way that it does not go out of date because it isn't technically themed to the future, it is themed to the ideas of famed European thinkers and explorers.
(Maybe theme it to just: "Famed Thinkers and Explorers.") This way, the actual theme does not go out of date simply because the word "Tomorrow" is in it, much like how "Frontier," "Adventure," "Liberty," and "Fantasy" don't make the themes of other lands go out of date. "Discovery" is simply focusing on things that have been or will be discovered.
Introducing new attractions and attractions that can still exist..
Space Mountain: Mission 2
Buzz Lightyear Space Ranger Spin
"Improved replica of Horizons"
Discoveryland Transit Authority People Mover
Monsters Inc. Laugh Floor Comedy Club
(Since the land is now themed to "Discovery," this would make sense here)
This would also give Disney the opportunity to replace Stitch's Great Escape. My personal opinion would be to replace it with a new version of The Time Keeper... Put the Time Keeper/9 Eyes animatronic in the middle of the rooms, and then put the circle vision 360* screens on the walls. The room would pretty much easily fit a brand new concept of this idea. Put a brand new pre-show video on the TVs in the first pre-show room. Create a great new pre-show using the "cadet" animatronic as a new Time Keeper animatronic explaining what you are about to do! Then go into the theatre. It could work!