Single pilot; no pilot, whatever.
Sitting out there, probably where you can't see him, on every aircraft that ever flies you will find little Mr Gremlin. And he's just waiting for the opportunity to push you through the third hole in the cheese. And when he does I'll want to know that there are 2 competent people aboard the same aircraft as me, trained to expect and deal with the unexpected. Why 2? Because the first hole could well be the incapacity of one of them.
It is utterly absurd to regard the remote operation of military drones as essentially the same as remote operation of highly complex air transport passenger aircraft. For a start, where's the saving? The pilots are only moving to another seat, with hugely expensive comms systems for controlling the aircraft. How many back-up systems will be needed? At least 2 or 3, each with alternate comms channels. Will duty hours change? No. Will 1 "crew" operate more than one aircraft simultaneously? No (think about it.) Etc etc. It's the stupidest notion I've ever heard, and needs to be put to bed for another 50 years to allow the technology to catch up.