The push for driverless automobiles is really an attempt by the trucking industry, including package delivery, to eliminate or at least reduce their biggest variable cost which is human labor. The package delivery people are pushing drones and the routine freight industry driverless trucks. What they fail to realize is that when they can make it a reality, the public will not accept it and force the government, who supports it to prohibit their manufacture and use.
I think we can all admit that pilotless planes can be made safer than ones that require a pilot but would we flying on one. I know I wouldn't because if one mechanical malfunction occurs there would be no one to override the automatic controls and safely land the aircraft. Since there can be no guarantee that nothing will malfunction there will always be a need to provide for a failsafe shutdown or at least the purchase of time to shut down whatever it is safely.