I keep hearing humans will evolve into their respective classes as people begin to stratify. Selective breeding = different types of humans, which can over time change into different species, like what is portrayed in the movie The Time Machine. It would be awesome if we could move into other planets, but I don't think that would hinder the stratification of the species. Stratification seems to make things unstable though. As soon as the ruling class gets too overconfident and they give up all attempts at self control they tend to get shut down hard by the underclass or by another group.
I for one would like to live the rest of my life in a giant blue alien avatar running around some crazy alien jungle. Failing that, I would like to see the natural world before it is killed off by climate change. Evolution is great if you live long enough to see it, but I probably wont.