I think it's 3 things (I have teenagers about to get permits)

1) Parents don't let their kids drive or walk anywhere due to safety concerns (real or unfounded) So kids have built in chauffeurs and thus a lot less motivation to drive anywhere. 2) Uber 3) Work returning to city centers.

Teenagers have parents driving them everywhere. They use Uber at college and then get a job in a city. I guess they could take on the expense and headache of car ownership but there's very little upside.