Back in the day, a kid fresh out of high school could get a good job. By his early-to-mid twenties, afford to have a house, two cars, a family, and one spouse could be a full-time parent.
Nowadays, college graduates struggle for that sort of decent middle class life.
It looks an awful lot like the country, as a whole, is getting poorer.
As for your statement that "specific workers can suffer," what I've seen firsthand is that it's more like the entire local and regional economy, based on particular manufacturing industries, has been completely devastated. The area's basically been in a depression for multiple decades.
It's not so much about sending people to school for a few months or years to learn to do something else. It's more that, back when people who worked in the factories had money to burn, they spent it at a wide variety of secondary businesses in all kinds of different industries. Now the factories are mostly abandoned, rusting eyesores. A lot of the commercial real estate's gone downhill and is near rock bottom; people simply don't have money to spend on anything but necessities. The bad parts of town seem to be expanding, the drugs are getting bad, most of the ambitious kids and the people with money all pack up and leave for somewhere else. The closest thing to a growth industry is healthcare for the old folks who were born here and are going to stay here 'til they die.
The fabric of an entire community's been torn apart. I've seen it with my own eyes. Simply saying "specific workers can suffer" is a euphemism that minimizes, or even denies, the true extent of the damage.