Exactly. Only this time it will be - any car you want so long as it doesn't have more than 4 cylinders and goes over 55 mph.
Seriously, I don't expect the cars GM will be forced to produce will be as good as a Model T, they will be electric and have a range of about 150 miles and take about 16 hours to recharge. Then many other businesses will go out of business because no one will be able to get to work.