I take your point but you can't also discount the air quality in cities being quite a big factor as to becoming less dependent on cars. LEV's (Low Emission Vehicles) are taxed less, for example (although the infrastructure is still lacking, perhaps CAV's (Connected Autonomous Vehicles) may one day solve that as parking could be placed further away and there may be more of a 'sharing' system in place, such that you don't really own a car, just dial one up like an Uber)