Many cities in the world have many thousands of far commuters arriving by train every day. And many of those people even live in single family homes and own cars.
Pedestrian and cyclist friendly cities have more vibrant street life, and are more attractive places to live. I've never heard of car restrictions leading to more suburbanization.
And no public transportation does not fix the problem. It helps a bit, but at the end of the day biggest part of far commuters are gradually cut off.
If decentralization is the target, then just state it.