The overwhelming majority of bad driving is caused by alcohol and other drugs, drowsiness, and inattentive driving.
Sober, well-rested human beings who pay full attention to the road are surprisingly good drivers, to the point where I'm not actually sure that robotaxis can reliably beat them yet.
Yeah, a hundred years from now fewer people will drive themselves, but considering how many people DESPISE driving and only do it because it's required of them, that isn't bad.