The story is one of continuing decline, and the UAW is just milking the situation for as much as they can get. For higher pay scale uaw union workers (not the $15 per hour temporary workers), total compensation including benefits is about $70 per hour, while comparable non union Toyota workers are getting $50.
GM continues to close plants, with five closing this year. The much publicized Cruze that was promoted during the bailout as the future of GM cars ends production this year, as does impala, volt, Buick LaCrosse, and two Cadillac models. Volt ended production about a year ago. That leaves almost nothing but trucks, SUVs, and crossovers.
During the 1970s GM made about 50% of cars sold in US. Now it's about 17%. For several years, sales of automotive robots have been increasing 30 to 40% annually.
Some effects? Flint Michigan used to be vehicle town. Since GM abandoned it, it's been little more than a toxic waste dump that's only in the news because people can't drink the water there.
I can't understand why any young person would want to go to work for a UAW shop.