It would also likely be an extremely regressive tax so I'm not sure it would ever be sensible. People live in the suburbs because they can afford something tha

It would also likely be an extremely regressive tax so I'm not sure it would ever be sensible. People live in the suburbs because they can afford something that doesn't suck. The ultra poor and the ultra rich live in the city, the rest of us commute. And that's only slightly hyperbolic.