The people who retrain are more likely to be people who are already doing something very similar. It'll be a small adjustment to their career path, where they decide to go in a slightly different direction than they were headed due to the areas where there are job openings. When millions of people do that over a decade, the economy shifts. The lowest level work (stocker, cashier, janitor) is a transient job anyway, not something that you spend your entire life doing (and god help you if you did). So those people are looking for openings to adjust their careers anyway. In a compressed example though:
- Netflix puts Blockbuster cashier out of work
- Netflix creates demand for streaming content
- Writer leaves CBS for a job writing for a new Netflix original series
- Writer leaves his job on a low circulation TV show to work at CBS
- Waiter who is an aspiring screenwriter lands the job on the low circulation TV show, flips off his boss.
- Grocery store cashier takes a job as a waiter to get some of that tip money.
- Old blockbuster cashier takes a job as a grocery store cashier.
We've got an episode, guys!
Most people who'll attempt to move sideways to a similar cashier or stocker job are most likely either students, or elderly and working as part time. In the case of the former these lower level positions getting abolished all over becomes a bit of an issue. As all of a sudden these new 'lower' level jobs demand you have at least a certain level of experience. Which then begs the question, 'where do you start'? I'm experiencing this exact problem at the moment.