All the more reason to shift to a pay-per-use model rather than the high-fixed-cost model of car ownership, which incentivizes uses your car for as many trips as possible once you've made the initial expenditure to buy the thing. If these get good enough and cheap enough that significant numbers of people can get away with ditching their cars, those people will probably end up in a situation where transit (including kinds with no tires) will be cheaper on a per-trip basis where it's practical, and robocars will make sense for the remainder.
public transport as implemented in Asia and Europe, especially for last (couple) mile sort of uses is an antiquated idea in a world of self-driving. In a city like San Francisco you could literally ban cars in downtown and have the local transit authority run something like Uber pool of cars that fit 4 passengers comfortably and do point 2 point transit with optimized routing 24/7. The reason buses/trains are so large is to amortize a bunch of things, not the least of which is the driver.
Bodies needing to go anywhere might become an antique idea very soon… the only reason roads exist is so you can go do work and pay taxes and make wealthy people more wealthy.
After that isn’t important, let’s see how much priority roads will get.
