There is some theoretical and practical limits though. The bigger problem is socioeconomic though, there is simply not enough useful work for that many people

There is some theoretical and practical limits though. The bigger problem is socioeconomic though, there is simply not enough useful work for that many people — and with advancements fewer and fewer actual jobs will meed to exist. So we are left with a change, for example something like UBI, which would majorly shift our entire economic system.