Depending on where you live in the world it’s just not possible for some people to live in one of those idealist walkable cities do to systemic segregation. Can’t afford to live there but that particular area still needs workers. This ideal community is reserved for a certain class of people.

If one place is really nice to live while a other is rather shitty, of course everybody will want to live in the nice place, which drives prices up, which means the rich people get to live in the nice place and the poor get to live in the shitty place.

The solution is of course to make all places nice. But ultimately you’ve got to start with one.