Given that the imagineers are working hard on getting Star Wars into Tomorrowland, the "tomorrow" fits even less than it does now.
Since TL hasn't really been TL for some time (well, I guess you could count the monorail and innoventions), should Disney scrap the name all together, and rename the entire east side of the park?
...it would need to fit in with the LAND suffix, most likely ( although NOS does not held to this "rule")
...it would need to be generic enough to include the existing and future attractions, and not be stuck only on the SW franchise
...keep the Submarine Voyage as part of Fantasyland
As weird as it sounds, my vote is for GalaxyLand. You still include Buzz, Space Mountain, the Astro Orbitor, but can also include SW under the same umbrella. It's a space themed name that can include future or past. Some variations without the -Land prefix could include: Galaxy Plaza, Galaxy Port, Space Port, Nebulla Place, Outer Rim, etc.
Of course, it means giving up the Tomorrowland concept all together.