I'm more concerned that the above reasoning is flawed just because it's untrue.

I don't know any yacht owning people but the few people I know with boats are very happy with it's size. The people looking for a football field on water are _limited_. Human desires are limited and if that limit can be achieved without the collective efforts of all humans then under our capitalistic model somebody is going to starve.

While I agree that the replacement of humans with AI would lead to joblessness, I think you'll see far sooner mass joblessness as a human with better technology can replace 50+ other humans (like containership engineer vs sailship crew).