AS the Flight Engineers, and the Navigators before them said.....
'They'll never get rid of us'.....
Just as a curiosity - Pan Am Clippers (Boeing 314 "Flying Boats") in the early days had a radio officer, a navigator (at the 7 foot chart table in the picture below), an engineer, a 1st and a 2nd officer at the flight controls, and finally the captain who was free to "roam" the flight deck, overseeing everything. The captain's position was the first to be made redundant, replaced by what was formerly the 1st officer (now captain).