Look to the future of automation. It can’t be too far in the future for airliners to be “unmanned” - in the sense that the two chaps up front are your teenage 200 hour aces. Technology and reliable data comms will make old geysers like us redundant.
The easy retort is that the paying passenger won’t accept it. Except the dear old paying passenger will never know that the two guys up front are little more than recent graduates of the Microsoft Flight Simulator games academy.
Hate to say it, but that’s all that will be needed in the brave new world of airline flying.
Experience has we know it is becoming ever more worthless.