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The problem with your scenarios is that, absent cheap FTL drives and a convenient habitable planet, your scenarios are insufficiently dire for evacuation to make sense.
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Exactly. Even if everything dies you still have gravity and air on Earth itself, you have the building materials on Earth... you have the people already on Earth.
Why build habitats in space when you can build habitats more cheaply and easily on Earth itself?
You need a disaster so big that it makes lifting all that stuff out of a gravity well and building in a vacuum with no gravity BETTER than building a similar habitat on Earth.