What the military are doing with drones is somewhat diffrent from what the public will accept giving that we all know a lot more about computers these days, unmand flight will grow of course and may even reach the cargo market in years to come but i doubt it will come into the pax market in your or or my life time.
I see it that in less than 10 years you will see it trialled for Commercial jets.
Biggest loss for a Military jet is the loss of a Crew as planes are replaceable, crew take a bit longer.
You could of course always keep a Pilot onboard who can take over in Emergencies if communications go down but ultimately it will happen.
As to the Cargo bit well they has been done for quite a few years in sending supplies up to space stations.
Of course if they develop a commercial jet with the capability to take off like a Harrier then Airports would become very small within 30 years.