I think driverless cars could be the future of public transportation. Instead of big trains and buses with limited reach, we would have thousands of public vehicles that take you where you need to go when you need to be there. It eliminates the big barriers to public transport--the lack of personal space, timing, and reach. No car? Just hop on the municipal/county dispatch website, request a car, pay your fee, and wa…
How do you deal with the inherent inefficiency of having a separate vehicle for every passenger (or small group of passengers)? Publicness is not the only benefit of public transportation. Trains and buses are incredibly efficient per passenger mile. They also take up a lot less space than cars, and last longer and cost less per passenger to manufacture. Making a car driverless doesn't solve these problems.
Anecdotes are not data, but our local buses (city of ~50k) rarely have more than one rider, and a plurality of those I see have zero riders. In our case, these autonomous cars would be a much more efficient solution.