I’m guessing there would be a whole host of new issues. Similar to this one. Broken down vehicles blocking access to areas. Parking in weird places.
Job loss from gig economy with Uber and such. Potentially an increase in cars if companies could have fleets of cars. An absolute shit tonne of bandwidth being required for all these cars. Software updates bricking cars. Some people enjoy driving so negative for them maybe. I’m sure there are plenty others. Won’t know issues until roll out really happens. Pros and cons to most things unfortunately.