Precisely right. Autobody shops will decline. Wholesale replacement of entire body panels will greatly increase. It is very difficult to form and mold alumninum. Cars will become disposable. The poor, when they can afford to buy a car, will get a used car full of crumpled body panels. The overall appearance of the nation will become like that of a third-world country.
It doesn’t take a very deep crystal ball to see all this coming, does it?
Aluminum cracks. Not good for a cheap unibody car bumping down a pot-holed Pennsylvania highway. Plus, as you note, aluminum work-hardens — IOW’s you can’t pull-out dents. The auto industry had a heck of a time learning how to deal with the deliterious effects to their tooling when they shifted to galvanized steel. My father had nightmares about that. (Tool & Die-maker at an automotive body stamper)