Realistically what's the proportion of car use between going to/from work (or the grocery store or other similar destinations) vs traveling the country for your average USAian? Especially one living in a dense metro area of some kind? And even then, I'm not saying we get rid of all cars, just that owning one shouldn't be a necessity in a massive, dense metropolitan area in order to get from point A to point B.

I own a car myself and use it regularly for longer road trips the few times of year I do that, but I avoid using my car like the plague if I'm traveling within 90% of the Netherlands.