I don't know what you would do in Tomorrowland anymore. Mid-20th century the outlook of the future was flying cars, massive cities, urban sprawl and all the technology of big computers and space travel.
That is no longer the view of the future.
If we were going to make the a land based on tomorrow today, it'll most likely be green spaces, low density human sprawl, focused on climate change and low pollution and sustainable living (Living with the Land anyone?). So how do you make a fun theme park out of that, because it's not as exciting as aliens, space ships and fast moving people mover attractions.
Disney is probably going to have to ditch Tomorrowland for something else. I'm a big proponent of getting rid of everything and starting from scratch somehow. Lots of wasted space in that area.