I judge a head coach by how the team performs. The goal of football is to win games and win the superbowl. If the team is winning, the coach is doing a better job than if the team is losing. Simple. Good coaches can lose games, but if you're consistently in playoff pushes and SB contenders, then I have a hard time seeing how the coach is bad. I don't think McDermott got fukked, he just got beat by a better coach and better team. I don't think Kyle got lucky, we beat the Packers in a messy game on both sides. Yes, football is a game of inches, but Shanahan has had a fair share of bad luck in his tenure. He's not some uniquely lucky coach. He was literally 1 missed play away from winning the Superbowl.
I'm not saying it's impossible to replace him, I'm saying the odds of finding another coach who can produce better results are objectively incredibly low. We've been one of the most successful teams in the NFL over the past few years. The only available coach I see that would be confident in making a move for is Payton. If you think Shanahan is a worse than average coach, then taking the gamble on a dice roll makes sense. But for all our frustration this season, we're still 1st in our division with significant injuries to our QB1, RB1, LT1, DE1, DT1, DT2, CB2, and S1. I don't know any other team in the league doing that. Perspective.