I'm entirely in favor of socializing health-care and limiting the work-week... or at least, for decency's sake, passing a law saying that the legally required 30-minute lunch break must be on the clock. And housing prices? They have to crash. They simply have to crash. I'm 22, and I demand that houses crash because I see no way I'm ever affording a house, otherwise. You simply can't have houses rise faster than inflation every year without putting them out of the reach of all but the most wealthy, eventually. In my city, you need to work 10 hours/week to pay for an old fixer-upper of a one-bedroom apartment, ha, let alone a house!
I don't think 10 hours/week for a real job will ever be realistic because, as you noted, there's a basic number of overhead-hours per employee every week for non-menial non-shift work. Bring the hours/week down too low and the overhead starts taking up a large percentage, fair enough.
But on the other side, yeah, "40" is right. It's not really 40 hours/week of work in the way factory workers had 40 hours/week. Well, at some employers they expect that, but I've never seen one where they really get that. Somehow we still end up with the "culture thing" of not admitting that we can, in fact, be productive in less than 40 hours/week of butt-in-chair -- despite the fact that objective measurements of productivity have skyrocketed.
Productivity has gone way up, but somehow it's just meant that the rich get richer while the rest of us work more and harder to keep our heads above water.