People still want to live in cities for the culture and benefits you can only get when a lot of people are in the same place. And those cultural institutions s

People still want to live in cities for the culture and benefits you can only get when a lot of people are in the same place. And those cultural institutions still need service workers. And people working from home in cities still need service workers too. And the restaurants. There will still be plenty of jobs for folks at the lower end of the spectrum, even if all the offices become housing. Arguably even more, since there would be more cultural institutions open at night.