I disagree, restricting humans is exactly what needs to happen for personal air travel to ever to be safe. The humans are the rogues, they're ones that are going to cause problems, not follow standard procedures, drink and fly, check their cellphones while flying etc. Imagine how much uncertainty and risk could be eliminated if you know that 100% of the vehicles in the air are all computer controlled, and use a common communication/navigation protocol. It would simplify everything.