One boring point I try to make here is that cars take up a lot of space, and that therefore too much car ownership is simply incompatible with desirable walkable urban areas. Even New York City has a hell of a lot of cars, but it simply couldn't exist in anything resembling its present form if one car per driving age household member was the norm.
The cars we will probably always have with us, but for too long city planners have failed to recognize that catering too much to the needs of automobile owners seriously damages the urban landscape. Cities can't thrive by being giant off ramps for tourists and sporting event attendees.