this is such a bad take. the point of public transit is not to get enough people to ride it so the system is profitable. do we expect roads to be profitable? they aren't, even if you say "the gas tax".
and lol at heavy rail can't meet needs that cars can. A single subway line in New York can carry 60k people _in each direction_ at peak capacity. Autonomous cars are years away and will never achieve that efficiency just because of space.