Pilotless aircraft will, by their very nature, require a fundamental and drastic overhaul and redesign of not just aircraft but the entire air traffic control infrastructure. The cost and time consumption involved with designing systems that are proven to work within that framework and to ease them in would be monumental. For many many years yet it’s going to be far cheaper and simpler to retain pilots. Yes eventually there will be pilotless aircraft, I don’t think anyone doubts that but - in an age where we can’t even stay logged on to CPDLC for more than five minutes - that day is not even remotely on the horizon.