That's it. It just doesn't take that many people to make all the stuff. Erie, PA isn't going to come back.
The mantra used to be that people would be employed in "services". But services are more automated, too. Services done at some fixed location are rapidly being automated. Mobile services, too. Some recent developments:
* Stock picking in an Amazon warehouse - robots taking over. [1]
* Doordash delivery - robots now deployed in Redwood City. I've seen one in the downtown area. People just ignore them as they roll along the sidewalks. Their active six-wheel suspension can climb a curb. [2] There's an experimental partnership with Mercedes where a self-driving van holds multiple robots and lets them out for deliveries.
[1] https://news.ycombinator.com/item?id=14062360
[2] http://www.dailymotion.com/video/x5g2a2g_a-robot-that-delive...