You say that bank tellers have been replaced by ATM's, and yet every high street I walk along has banks staffed with real people. The fact is that people in general don't trust machines. So I can't ever see the pilotless aircraft coming to fruition. Technically it's possible, of course it is, UAV's pretty much look after themselves, but I really don't see the public getting on an aircraft that doesn't have a human sitting in the pointy end.