One interesting and troubling aside:
This is focused on the working class and so doesn't talk very much about college educated people. But it does mention education, and still holds it up as a way forward. Well, that's also being hollowed out.
There's a large and growing number of college graduates who cannot find a decent job and who amass large amounts of student debt. They did everything they were supposed to, but the jobs aren't there. Or the jobs are not what they used to be (see adjuncts v. tenure in academia, for instance). Or after all that schooling and debt, you have to "pay to play" by taking long term unpaid internships in expensive cities, which only the affluent can afford.
This is bad on its own for people who would normally go to college and get white collar jobs, but it also destroys upward mobility for the working class.
It's not just about unions and manufacturing any more. Hollowing out the middle class has become structural.