Cheap/slave labor isn't the only reason companies went to China. There's EPA regulations, OSHA regulations, union labor demands, burocratic red tape, high taxes, etc.,etc.
They might leave China but I doubt many come back here
+1. There has been a lot of movement to India in the past few months. Indian Prime minister met with Trump a few months ago. They are smarter then the Chinese and are not warmongers. It will be very very interesting.
