UAV's = new liability. Insurance companies will dictate the advancement of, implementation, and the costliness of this technology...a long time from now. It will be a hard sell to the insurance man as to why you currently have expert technicians (pilots) on board your 150,000 lb missile, and should now leave them on the ground while 150 passengers and a half dozen FA's go for a ride with lawyers salivating at the chance to sue you out of existence on behalf of their families should anything go wrong. The accident rate in the Mil UAV world shows this technology is a long long way from being even considered for this purpose.

By the way, the technology for the driverless car has existed for 30 years. Popular Science predicted it would be here by now. It ain't here yet. What engineers believe is one thing, implementation is entirely another.