This is gonna happen. It's just a matter of how soon.
The technology has existed for years to automate and remote takeoff to landing with NO pilot on board. Having one Captain on the deck watching every thing is a no brainer.
Most of you are too young to remember the fight over the loss of the flight engineer and before that, navigators.
When the Air Force got INS, the navigators clung on for a few years for air drop missions. Most of the time they slept or did busy work.
Cabin service will be automated as well.