The old story of the pilot and the dog on the flight deck. The dog bites the pilot if he touches anything.
Technology has replaced the navigator, the flight engineer and so will go the pilot. When?
When the baby boomers are long gone and the next generations have taken over. The ones that have been raised on Microsoft Windows, cellphones and American fast food. Their life expectancy will be nothing so risking a ride on a pilotless plane won't be much of a concern.