I think it's the natural evolution of the species, at some point Earth will not be able to sustain all of [human] life and we will need to live elsewhere. What better way than to have special cybernetics which can actually survive hostile environments in space? It may not happen in our lifetime, but humans are already connected to technology far more than we ever have been in history. The average person has a computer in their pocket, a computer on their wrist, a computer in their car, or even a computer in their glasses... Not to mention the multitude of technologies which already could be considered cybernetic such as hearing aids, pacemakers, artificial organs, etc. Will it be Deus Ex? Maybe, maybe not. I don't feel that Deus Ex is really that far from reality either way.