Self-driving cars perpetuate an inefficient, dangerous, expensive mode of transportation. Individual cars contribute to deaths far more than buses, trams, trains and subways. They clog up streets and cause more traffic. They insulate the wealthy from the poor, making it easier to ignore society's problems. And the poor can barely afford public transit, much less the more-expensive self-driving cars which take up more of the roads (which taxpayers fund).
I'd love to not have to drive myself around! But I'd love it even more if there were affordable, timely public transit to drive me around.
Depending on how you look at it and where you live, public transit can be FAR more expensive than owning a car.
Around here, public transit adds about a minimum of an hour to most trips, easily topping that if you go multiple places in a day. So lets just say an extra hour both ways on your commute every weekday, and figure that also includes some extra stops when needed.
That would cost someone making $15/hr about $7,500 a year in lost time, not counting fares. For me, the number would be closer to $40,000/yr if I was doing productive work instead. My wife and I have three cars and STILL don't spend that much a year on them (it would also take more than an hour a trip, since the nearest bus stop is a 30+ minute walk from our house).