I'm not worried at all, because the jealous, anti-progressive, pessimistic commenters littering this thread are not the dominant force in society (even if they did have a numbers advantage, which I don't believe they do, they would lose by the inherent virtue of the weakness in their personalities), and people like Musk, Bezos, and the thousands of engineers executing their visions will ensure humanity has self-sustaining off world colonies in just a few centuries.