...why? Having control of the car requires paying attention to the car and surroundings. I'd rather be able to ignore all that and have more time for reading (whether educational or entertainment) and such.
That said, in order to get the true efficiency of computer controlled vehicles, it really helps to have them all computer controlled.
That never happens. People that love surfing will surf at every opportunity you give them, people that love eating will eat nearly anything you put in front of them. People that love driving.....well I need a ride to North Dakota.
Many people enjoy driving a sports car down a mountain road with light/no traffic though. If you wanted me to drive you from Flagstaff to Sedona[0] in a Mazda Miata, I'd do it happily, over and over. I would rather do that myself than let a computer do it, even if the computer can do it safer and faster.
[0] https://maps.google.com/maps?q=flagstaff+to+sedona&saddr...
Devil's advocate: For humans who insist on trying to drive anyway, we can give them race tracks or have designated "Human Driving" areas. It won't ever go away completely.
In areas with significant congestion however, such as the entire city of Seattle, requiring computers to do the driving and navigation could significantly improve commute times (by, like, an order of 10 during peak hours), but only if everyone is on board.
Even if you let the car/plane/misc operate itself, the legal ramifications of rooting are interesting (presuming you've already reached the point of having cars without manual overrides, that is).
Imagine the impact of rooting your car on your insurance, for example.