I guess what I find more appealing about Auto industry culture is the general notion of accountability (give or take) with respect to products. Auto companies are not nimble, should not play 'fast and loose' with regulations like safety, and they have public shareholders as well. This is a different model - one that I honestly believe serves the Auto industry well - because there are perfectly reasonable avenues to take SV-like approaches - it's called R&D, and taking stuff out racing. WRC. BTCC. Le Mans. All sorts of different avenues!
This isn't to give Auto companies like Ford a free pass when they make mistakes (Firestone and Ford comes to mind) but rather acknowledge that there's still merit in their approach to creating, manufacturing, and supporting products.
A couple cursory Google searches hasn't yielded any hard data, but hopefully someone has come across data on this.
tldr; I don't disagree with your assumption for decreased ownership for personal transportation, but I don't see this changing for families that live outside the Urban core until decades from now.
> I'm interested in the birthrates for the 50-75th income percentile for living in major cities (not metropolitan areas).