When it first opened it was. Anymore its more like Discoveryland (As an aside, I'd actually prefer for the name to be changed to this if they're not going to continue to support the futureworld theme). As already pointed out, SSE was about how communications developed throughout history and how they would direct us into the future, Horizons was most definitely about where we were headed as a future, Universe of Energy was about finding new energy for our future and the different ways we might do that, World of Motion was again about the history of the automobile, but also looking forward to how transportation will be in the future. The Land has always been futuristic leaning with the scientific research they do there about growing crops. Granted the imagination ride was more about understanding imagination, but it was with the idea of how imagination helps us develop new technologies and ideas, so even in that vein it was about the future.Future World has never fully been about the future...the Imagination pavilion wasn't ever really about the future and the current version of the Seas certainly isn't. Cars-Land lite is my prediction.
Then of course we later added the Wonders of Life which I agree wasn't as much futuristic looking as it was discovery oriented but the idea of shrinking down and being injected inside a body could be future oriented. I'll agree that this is really the first pavilion that started the move away from future based attractions to learning attractions. The Seas were very futuristic when they first opened. The idea was that we would live on the ocean floor. They built a undersea laboratory that we all got to go visit. Granted its not future looking in its current incarnation, but its still education oriented.
As I said earlier though, I agree that we've moved away from the idea of futureworld and into discoveryworld and I'm ok with that as well. I like the idea of edutainment and I don't mind the use of cartoon characters to do it. I don't really like the ride they put in the seas though. I wish they had used the characters from the ride to teach us about the ocean rather than just reliving bits and pieces from the movie. I think they missed a great opportunity there. However the rest of the pavilion does that nicely so I can slightly ignore that mistake.
That said, I just don't see anyway that a Cars based attraction like radiator springs fits in either Futureworld or Discoveryworld. I see that eventually coming into DHS, and I'm very excited about it being there. I don't see anyway that we could use the cars characters to teach us anything about our world.