Why isn't that a great solution to a problem?

It's likely that self-driving cars will eventually be better drivers than real people. Obviously, it's not like that at this point, but AI gets quite a bit better every year.

Think about the number of man-hours people spend behind the wheel. Taxi drivers are automated, and people who own cars and do something else while in their cars besides operate the car. It's a huge stress and efficiency boost for society.