Ok, I take it as an obvious prerequisite that you have to have transit for people to use it. Such that, yes, it isn't enough to just tax the heck out of cars to force them to start walking long distances.

But I point to Atlanta as easy evidence that having transit cover hot spots is clearly not enough. I used it daily for over a couple of decades to get to a job where I was among the only people that used transit. Amusingly, this was among a crowd of folks that loved preaching the virtues of transit. As soon as they made enough money to afford a car, they got one.

Even in Seattle, with what seems like nicer transit to me, I see plenty of people getting a car when they can afford it.

Tokyo, famously, has strict rules on if you can register a car. Despite that, it is amusing that the silly AI answer still ends with "though car ownership remains higher in some affluent neighborhoods." Which was somewhat obvious to see when touristing the place.