How many airframes & lives have been saved by human pilots recognizing various types of runway incursions? Delaying a rotation or rotating early? Going around? How many pilots have saved engines and tires on aircraft while avoiding FOD while taxiing? How many ATC controllers have made errors that a human pilot trapped, preventing an accident? What about enroute weather considerations? There are so many different situations that can occur in aviation and it’s human pilots, making human decisions that keep it safe.
Technology and hacking is not what will prevent pilotless airliners, it’s the required human interface that will.