If cars disappeared you'd probably just get narrower "roads" in the long term. The real-estate is still valuable, not every city is going to be able to justify

If cars disappeared you'd probably just get narrower "roads" in the long term. The real-estate is still valuable, not every city is going to be able to justify letting it sit idle as what is basically park space even though that would be nice. I think over time the cities would sell it to be developed and used for commerce/housing/whatever.