[klmadfejno]

> (No, planetary migration won't keep GDP growth going any time soon. Humans could settle on the Moon or Mars but they're too far away to contribute much to our Earthly GDP. They'd be mostly isolated economies of their own.)

I don't really agree with your take on things but this one stuck out to me as particularly wrong. If there were suddenly another population of humans on another planet, there would, at a minimum, be a regular flow of digital goods, as well as physical shipments, largely one way earth -> mars.