To what extent does that stay true when you can get picked up quickly, not have to worry about parking, and it works out to cost a fraction of the price of owning a vehicle?
In most European cities, the transit system does exactly that – even in my outermost suburb of a German 250k city we have 4 buslines nearby (within of 4min walking) with a frequency of 15-30min, and a few more with an hourly frequency.
So why do 15-30% of people in these cities still drive? What will self-driving cars provide that transit and rentable cars didn’t yet?