This is something that I'm working on and hope my next startup will be about, I know there are others interested in it. The problem is generally the regulatory environment, it's a surprisingly difficult thing to do in any habitable location.

Marc Lore is working on this, throwing his billions into a concept for a new city out in the desert somewhere: https://cityoftelosa.com

The team at Culdesac are trying this in a "compliant" way, they built an apartment complex with basically no parking in Tempe, AZ but are positioning it as a car-free neighborhood. I believe this is their prototype and they hope to scale it up in future projects, this is about as realistic of a path as I think anyone has.

Building for cars is required by law across North America, and getting around that is quite hard.