True, but colonization as a survival measure also becomes less imperative. If your human-equivalent nanomachine body is robust enough to live and reproduce on Titan (which is far from a given- the idea that machines are inherently more durable is in some ways an artifact of the complexity of the machines we are accustomed to, and of what we consider ‘robust’- an iron bar is strong but a tree doesn’t rust in the rain), then it’s also able to survive on whatever sort of hellscape Earth has been rendered into, with, once again, access to more installed industrial capacity, sources of energy, etc.
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