Not I CC...
I have had the privilege of going to summer homes on the lakes owned ( by now deceased ) Big 3 suppliers many who made it in Detroit and left for the burbs. Hard working Poles, Italians etc etc that made stuff, they got their start their and I maybe nuts but it could happen again.
Ya never know the door handle king, or engine bracket mogul could happen again, but maybe with a different industry, that one is to mature at this point.
Are you implying they would prosper in Detroit city?
There is quite a pool of knowledge in the Detroit area. It was only a couple of years ago that a new flash hardening process for steel was developed by a Detroit area metallurgist.
The Detroit brothers custom cycle builders had a short lived TV show were they brought in local guys to build things like a corn harvesting combine from a pickup truck. The show was a knock off of monster garage but they concentrated on local knowledge to do the stuff.