I can see how you'd think it'd be sorta meh. It definitely is outdated to some extent. But I like its retro appeal and I almost wish they'd tap more into that. I think it would be cool to see them do a ride, interactive exhibit, or something that is themed specifically along of the lines of "here is where we thought we'd be in the 2000s" and run like crazy with it (flying cars, jet packs, floating cities, etc., ... on second thought they could just bring back Horizons into Tomorrowland).
But admittedly, it's a particularly hard themed area to keep up just because technology is so rapidly changing and advancing. A goofy looking robot awaiting some intergalactic space flight (seen on the TTA) loses some appeal when you have a computer in your pocket more powerful than that of the one used to get us to the moon. At least in Adventureland or Fantasyland things can generally stay the same over time without suffering from that outdated look (to an extent).