I don't want to undermine this piece too much as I think it is an important issue and what I'm about to say doesn't address all of the details. But I also believe it's an issue that will be partially solved by automated cars. As soon as it becomes palatable to live further from the city and commute; and, to a lesser extent, free up space from car parks, this problem will be dramatically reduced.
I think much more than automated cars, what will help is the Internet and new technologies making it ever easier to work from home, instead of having to "go to your job" in the city.
Higher residential density would be survivable IF "work at home every other day" was somehow legally enforced. That would maintain the face2face fiction while also increasing density without collapse due to congestion.