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Maybe. If we stop finding reasons to kill each other - I don't see that happening for a very long time.
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Irrelevant. If we had, say ~225 year lifespans instead of ~75, we'd probably still have Einstien around to help develop proper propulsion. Even without that, we'd have more people willing to look into a trip to Mars, since it wouldn't require one spend a full 10% of their life in a tin can, with a good chance of dying a radiation before you even get there. Wars and other 'reasons to kill each other' would certainly hinder such efforts, but wouldn't preclude them.