> The interiors are nice, well air conditioned and don't smell
If they scale, that will become a problem:
- people puking in car
- people having sex in car
- people eating greasy fries in car
These happen in public transportation too (the sex one not as often, but puking, eating smelly/gross food definitely), but the big difference here is that users won't be anonymous. The next waymo rider (or waymo staff if the car stops by some inspection checkpoint between rides, or some extra in-car sensors) will be able to report the incident, which would flag repeating bad riders over time.
Overall the experience would be as good as a Uber today, as like you said, no roll of the dice on the driver.
Another new problem specific to self driving and not seen for public transportation: muggers driving a high speed bike targeting isolated rides (they'll know how easy it is to make the car stop, smash a window, and get the rider's valuables). Basically the modern version of stagecoach robberies.
One could argue these already happens in Europe on highways with traffic jams, but I can see the muggers being more active at night, since in addition to knowing the rider can't try to escape, there's also less crowds around. It'll be very dependants on regions : In Phoenix, I'd assume less often as muggers won't know if the rider is carrying.