This is backwards. With public transport you have to be near public transport. With a car you can go from any start point to any end point. Banning cars would mean you either work in a local coffee shop or supermarket or something, or you work in the office buildings and large employers at public transit hubs, which are usually downtown. It increases concentration of jobs into zones, increasing the need to be in a residential area that can access them, increasing demand for those locations, increasing wealth inequality by limiting access to jobs based on where you can afford to live.