If you live in a city, you can (and probably should) get away with not owning a car.
That very much depends on a particular city. And your lifestyle, of course.
True, some cities are much better built for that sort of thing than others. I had San Francisco, Seattle, New York City, and Valencia in mind specifically - less so Los Angeles and Dallas-Fort Worth.
Agreed with the lifestyle part, though - it's really a question of how often you need to do things that require a car, and how expensive the next-best option is (taxi, car rental, ride-share, borrowing your neighbor's). If you want to drive three hours to see your Mom every weekend, you probably don't want to sell your car.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.