It's an interesting question for sure. Reading the posts I see some people dont understand the exponential nature of technology evolution. (Moores law= Computing processing speed doubles every 18 months as a very basic example) Yes, if technology growth remained linear then no way would we have pilotless or minus one pilot aircraft in 20 years. If you think about business advantages and exponential technology growth, then there will become time in the future and almost instantly, where if Fedex, UPS, and Amazon DONT have a pilotless plane then they will be at a severe financial disadvantage and wont be able to compete. The public wont care if large planes are flying overhead if its proven without a doubt a pilotless airplane is much much safer than a human flown one, and that time will come sooner than later (it wouldnt matter if they did either...large companies tell the public what they want, not the other way around). Its all about exponentail growth of technology. Heck, IBMs Watson is already proven to be better in legal cases than a human Lawyer.