But HOW do you keep an economy alive if more and more and more jobs keep getting replaced by technonolgy? Eventually even surgeries will be made on a machine like the one Prometheus. Maybe in 100 years, who knows, but it will eventually happen. Even if it's far, transitions have to start happening at some point.
Who
needs jobs? What do we need "an economy" for?
That's the theory though. In practice, bullshit jobs will continue, and if/when we expand into space, that will create a lot of jobs too (even if a lot of things are automated, there will be need for proper planning, etc...).
Bullshit jobs exist because guns. With that mentality, we will not make it through the next 100 years let alone into space.