Earlier quoted context omitted.
It took three generations of flight training for checklists to become an essential part of aviation. Note that a flight-training generation is less than a human reproductive generation; it's the time from first lesson taken to first lesson taught (plus some). It had to wait for the older instructors to retire. We are still in transition, in medicine. Many physicians have not yet cottoned to hand-washing, yet.
> Many physicians have not yet cottoned to hand-washing, yet. What?!? How many generations has it been since Louis Pasteur?
And about 150 years, so 4-5 generations of surgeons. Not exactly many.