Systems-Drive-Behavior. Autonomous people are accountable for their decisions. This comes from an organization that has “big enough” managers and people in the right roles with the right accountability + authority to do their work.
All managers should be provided with the unequivocal authority to decide that a particular person, who is no longer working at a minimum effectiveness required for their role (for example the persons best is NOT good enough for the role), whether due to loss of commitment, not keeping up with new knowledge and technology, whatever the reason. This person will no longer keep their position with that manager, they have been de-selected.