Most cities with a subway or significant bus infrastructure have very high population densities. "Everybody drive" is not going to work in places where driving

Most cities with a subway or significant bus infrastructure have very high population densities. "Everybody drive" is not going to work in places where driving isn't already the default mode of transit. Plus, few people can afford it. Have you looked at the price of a parking spot in e.g., major parts of Boston or NYC? 5-6 figures to buy, or hundreds/mo to rent, and that's with working mass transit. I guess that those prices would at least triple if everyone started driving. Lots of wealthy people take the subway and commuter rail. I don't think cycling is the solution. But cars are definitely a non-starter.