I don't think great things in civilization get done solely out of people needing to work the bare minimum to survive anyway; if that's all they were going to work, just paying them $10k subsistence is not a huge loss to society, and even pretty cheap by the standards of the other stuff we spend money on. Actually it'd be a pretty sad commentary on civilization if it were only the threat of literally being homeless/starving that inspired people to work; that's what it was like in subsistence-farming days, but surely a wealthy country can move beyond that, and make the baseline something higher, even if only "ramen + crappy apartment"? Plus, I think we'd make it back in how much it'd increase entrepreneurship if people felt more confident in a safety net being there if they failed (people from lower-class backgrounds w/o a family safety net, in particular, are very afraid to leave steady jobs if they have one).