[rhn_mk1]

Cars becoming illegal over night is about as ralistic as popping up infrastructure replacing it over night. It's a complete straw man.

In reality, cars can only disappear gradually, with less-car-dependent infrastructure replacing them as they go, and prices adjusting together with that. If you want to find reasons that no-cars can't work, you'd do much better by acknowledging that their disappearance would bring wider changes to urbanism.

(Also, it's not unheard of to choose a job based on what's in the area. Academic couples do that quite often: when one moves, the other often tries to find a job based on where they go.)