If the movie Avatar has taught us anything, it is that Sigourney Weaver looks terrible as a native inhabitant of another planet. And that theatres showing 3D movies need to allocate vomit bags to all viewers (long, smelly story).
I guess my point is there is a difference between science fiction and science fact. Do we honestly think we will have the technology within 100 years to send people to another inhabitable planet? Or to terraform an uninhabitable one? And why are we, as a species, so important that we need to perpetuate ourselves ad infinitum? Seriously, if humans are as good as it gets then God help the Universe.
"So long and thanks for all the fish!"
James.