To elaborate more, FedEx is very unlikely to go to "single pilots" unless the entire industry goes that way. Certificating an aircraft for that would be a big ticket item and very unlikely to recoup that investment. Add to that the fact that it would have to be approved by each country you went into, just imagine the nightmare. FedEx sticks to aircraft that can easily get approval to fly into anywhere the company wants to take them. Just because it can be done does not mean it will.