Not so great for getting cars out of NYC and pedestrianizing more of the city/moving towards more “low traffic neighborhoods” as I imagine Waymo and other similar companies are going to fight against these efforts.
Edit: Lots of people talking about human drivers taking advantage of self-driving cars being more cautious/timid. Good news is that once you have enough self-driving cars on the road, it probably slows down/calms other traffic (see related research on speed governors).