I remember flying when there was a three-man crew in the cockpit: pilot, co-pilot, and engineer. On some smaller passenger airplanes there is already only one person on the flightdeck. Eventually technology and technophobes - as witnessed in some of the previous posts - will sufficiently advance to accept a one-person crew flying increasingly larger airplanes. Regulations will be adapted and none of the young'ons will remember a two-person flight crew. Nobody said it will happen tomorrow, but a gradual implementation is reasonable, just as A-380's still have three men crews and a back-up crew on long distance routes.