His death is a reminder that life is fleeting, and they no doubt will measure their time on this earth against their time as an NFL coach. The job of being an NFL coach isn't much fun these days, even when one is winning. Look at Norv Turner. The Redskins coach is 4-2, and he has an owner who interrogates him after every loss or close call. Mike Shanahan has won the past two Super Bowls, and I've actually gotten inquiries from Denver fans who wondered whether he should be fired for his 2-5 start.
Football is a sport that demands stability, especially on offense.
Injuries are a reality, but to survive those injuries, you must have reasonable depth. Coaching staffs needs to stay together, teaching and developing on a consistent basis, and coaches these days are fired about every two years if they don't produce a playoff team. And every time a coach is fired, an offensive coordinator from another team is promoted, and then that guy has to be replaced. And so forth. There were a lot of coaches around the league who were appalled at Redskins owner Daniel Snyder pulling Turner into a trainer's room shortly after the team dropped a 38-20 game to the Dallas Cowboys.