Its a simple calculation at the end of the day. If the safety engineers can show that the aircraft can safely be flown in cruise with only one pilot, and all failures can be handled by that one pilot, there's no reason from a technical stand point why this project isn't feasible. I think that most of the opposition will come from the human factors side of things. That's the purpose of the next few years of testing. Ie. To prove that its doable.