Well, first, mrshadowgoose has a point: I know a lot of people who would love to take a self-driving car but wouldn't got near a bus.

But also, while I'd love (love!) to see much better, European-style public transit in US cities, it would take a fantastic level of political will, lobbying, and pitching to even begin to happen. For all sorts of reasons, public transit is wildly unpopular in the US, and construction is wildly expensive.

But a company like Tesla could (if they could figure out the FSD part) just roll out self-driving taxis after a few legal tweaks. It's achievable in a reasonable timeframe (once the tech is in place).