Your smattering of examples of "why we need to have transportation" are all from a very specific niche.

Let me address a much larger and far easier to stomp out area.
The suburban commuter on their daily voyage to get to a job.
Suburbs are dead.
The daily jobs are dead.
And all that roadway in between will be vacant.

Your assumption is that this large group of people, the very ones that might benefit from self driving cars, are going to exist in the near future.

My thinking is they won't.

The jobs are dead. Advances in robotics and computing are destroying all of these jobs.

The suburbs are not a sustainable development.

The suburbs are dead. Emotionally, Morally, and with the loss of jobs, physically.

The jobs that are left will done via the internet.

So, for a great part, the majority of the traffic jam causing traffic will disappear.

How will humans survive? How will they survive without a job? Well that is the shift that is happening right now. Its the whole reason that so many are talking about Universal Basic Income.