But the second pilot must not be physically in the aircraft , but on the ground serving multiple "airborne" pilots . That is at least what the NASA Conops study implies . The RPA/ UAV emerging technologies are slowly coming into play , not advocating it, just making the remark .
As to the freighter following a pax , Airbus already works on that one , together with their " Fello' fly" project. I am going to watch the first tests soon , looks like fun ..