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You haven't taken into account car pooling. Driverless cars can do adhoc car pooling. I can even see things like local 4 seater driverless cars picking you up, and taking you to another 10 (or more) seater vehicle for the rest of your journey. (By definition the congestion is because a lot of people have overlapping routes.) Additionally you are no longer to blame for your commute since the driverless system would be…
Many people don't like sharing a car with strangers; I doubt this will change as quickly as the technology.
Driverless cars have many possible solutions. A simple one is pricing - it costs $5 more if you refuse to share. (And another $5 more if you want massage seats.) It is possible to completely partition the seats from each other so each one is effectively its own cocoon where you can play your own music as loud as you want and are completely isolated from the other passengers.
Heck it is even possible like many current electrics to have a base chassis that includes the motors and batteries in the floor, and have pods that mount on top. You could have your own personalized pod you keep at home.