I do not believe that the elimination of unions alone will bring back business or manufacturing jobs. It is just one spoke in a wheel that includes numerous ridiculous government regulations such as the endangered species act , wetland preservation (on non costal land), ADA, cap and trade, CAFE standards, EPA’s impossible zero pollution policy, and the mountain of paperwork required to satisfy the overlapping regulations of bureaucrats who need to justify their fat taxpayer funded paychecks.
Get the government out of business, and, even with vastly different pay scales between the USA and the third world, business will return. Let the states compete with each other. Why else is the South growing while the “rest belt” is on life support???