You guys are acting like urban is the same thing as metro. Things in urban areas are still far apart a lot of the time. Urban sprawl needs to be fixed (which involves relocating millions of people) before the banning of cars would even be even somewhat reasonable.
I believe that I said in an earlier comment that I’m not a fan of bans. This is just a funny meme, which serves as a good jumping off point for discussion. Rather, the policies that I am suggesting here (user pays, essentially) are one mechanism by which urban sprawl could be fixed, without government bans or mandates, respecting individual choice. There’s one heck of a lot of land devoted to driving and storing cars that people could easily and quickly convert to housing, food production, and other necessities of life.