It costs something like $10k-$12k per year to own a car in the US. That's a lot of robotaxi rides. But I can't imagine self-driven cars disappearing either, though I can imagine them being banned in city centers within a decade.
I guess the parent is referencing this kind of study:
> The overall average cost to own and operate a new car in 2025 is $11,577 (decrease of $719 from 2024).
https://newsroom.aaa.com/wp-content/uploads/2025/09/UPDATE-A...