Pilotless commercial aviation won't happen
It's got nothing to do with thh technology, nor security.
Why would it happen anyway? One reason only - to save costs. But the development and certification cost would be ten times bigger than huge. In any case, the aircraft would be 'piloted', but by somebody on the ground. So you might be saving hotel bills, but not salaries.
And anyway, who would choose to fly in a pilotless airliner anyway, when presumably there would be plenty of traditionally-piloted alternatives? Would you have confidence in a Michael O'Leary of the future announcing that - in order to give you the cheapest fare possible - he was doing away with the ultimate 'frill'?