I think a good theme Disney could use for a revamped Tomorrowland is time travel. I've always thought that time travel was universally known as futuristic and due to it being scientifically impossible (as far as I know

) it would never actually get outdated. I agree with the thought of Disney being afraid of attacking what the "new" future is, especially since today's future and 10 years from now's future could be dramatically different. However, if they use concepts that may never be possible then the quality and life of the attractions would increase.