The failure of that film to take off helps prove that it isn't a topic that has broad appeal today.
Eh... I think a lot of it has to do with the fact that it was a pretty awful movie! It was a heavy handed message with nothing really in the movie to help inspire it. And this is coming from a guy who eagerly anticipated the movie from the moment it was announced and poured over ever detail leading up to the release! Watching Tomorrowland in the theater was a very similar experience to watching Phantom Menace. At some point early on, you just knew they messed this thing up badly and it got harder and harder to go along for the ride.