3D printers sure look like they could help with this problem in the future. Heck I'd love for mandatory escrow of every component's 3D models with an agency which has the power to release them into public domain upon certain conditions (car company fails, component no longer available from any manufacturer, class action successful, X years have passed, etc)
If 3d printers today could do suspension parts, do you really think that the lack of 3d models would mean that they'd be useless for restoring old cars?
As I pointed out, 3D models help with a minor problem, a problem that has other solutions. They can't make much difference.