Among the opening scenes of Avengers: Endgame, Tony Stark sits on what amounts to a sinking vessel and stares in the void not knowing exactly what's to come. The same feeling can be attributed to multiple high-profile coaches around the NFL. They don't know exactly if their situation will drastically improve in the near future or result in failure.
Each will certainly try his best to rectify what went wrong this past season and get the job done. But they do so with full knowledge that another year of disappointment will almost certainly cost them their jobs.