And people were lost without the home button? Wow...
Any Hitchhiker fans? Remember the steering wheel from the Heart of Gold in the movie? The size of a damn good New York bagel? It would seem any 'car' has to have at least some way to control it, or one huge red stop button that stops it cold, right there. Maybe with a 'pull over and die' button that will at least try to ascertain where the nearest area to shutdown is.
This isn't Minority Reports. There aren't other autonomous controlled vehicles out there, and the roads are not free of 'distractions' like people, kids, dogs, cats, small creatures from Alpha Centauri. Imagine being in a plane with no cockpit. Yeah, so seriously not even willing to think about getting into something like that. It'll be a REALLY hard sell...
EDIT: Funny thing though. A sarcastic psychiatrist I know, when I told him I had a fear of flying (my wife said it was a 'fear of losing control') said 'What's to fear about flying? You sit in a seat with a 300 pound person smashing you into the person on the other side of you, and the plane, if it crashes, it's over in seconds!'. Except, all too often it's NOT over 'in seconds'. Some crashes have played out over 30 or more minutes. I mean, if it was guaranteed that it would end in seconds, I guess that would be acceptable, but to spend 30 minutes in a plane about to crash, with no one able to potentially save it? I'll walk...