If you believe that post scarcity is possible at all, you might consider that space colonization is also possible, but that brings about new significant requirements and needs that our economy will have to meet. Personally I think our civilization's ambition needs to expand so that happens. If we are still putting the "American Dream" as a goal when that can be built and satisfied cheaply by automation, then our goals need to change. A post scarcity economy would be able to meet today's American Dream easily and with little trouble, and yet we can't shake the mindset that you have to earn it because that makes it mean more or something.
Oh I'm not saying we force people to do space jobs or livings, only that it should wayyyyy more accessible and common than it currently is and certain sectors of the economy will need to support that. It gives us more of what we can't realistically create on Earth, which is more land.
The American dream is a challenge for people now. If we advance to where it's no longer a challenge because the pieces of that are plentiful and cheap and is given to everyone by virtue of existing, then we need a higher challenge because we've essentially "solved survival on Earth" and must now expand. IMO it's way better than just becoming an economy that focuses on producing luxuries or inventing new financial gadgets.
