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The alternative is to artificially limit our success.....
I would like to see colonization of other planets and moons. But, it is unlikely there will ever be a mass migration away from Earth in the same way as people migrated from Europe to the USA or from the Eastern USA to the West. The transportation will be prohibitive to transport a billion people to another planet.
Actually back in the 16th century the idea of transporting large numbers of people in wooden square riggers across the Antlantic Ocean must have seemed quite an unlikely scenario too.
I am a believer in the idea that "everything we think we know is almost certainly wrong".
The moon in particular has lots of Oxygen, but is limited with Hydrogen and Carbon. So things like a plastic shopping bag might be precious beyond all else.