Before you get too carried away with considering UAV - "pilot less" aircraft...ask yourself why most train systems around the world still use drivers given that automated trains are in use in various countries. Also shipping could very easily adopt this concept until the marine pilot jumps on board near harbour.
The first step would surely be single pilot high capacity RPT, not likely in the next twenty years.
Another small point, most US military UAVs "drones" still have a pilot somewhere, and a payload specialist. Have a look at the film Eye in the Sky...
https://en.wikipedia.org/wiki/Eye_in...ky_(2015_film)