The NFL is a success-oriented business. Not incrementally successful, not marginally successful, not inconsistently successful. We’re talking wildly successful, as in Super Bowl successful.

We’ve already talked about that group of quarterbacks who have proven incapable of winning titles and yet keep landing bigger and bigger contracts. And for some reason, teams also seem to want to stay with their head coaches whose best days are behind them or who aren’t going to even have any best days.

These NFL coaches are on thin ice in 2024 — or at least they should be.

Mike McDaniel, Dolphins

Kyle Shanahan’s former assistant has created an offensive juggernaut in the AFC, but they’ve been shown to have glass jaws in cold weather and against the NFL’s best teams. Miami has lost 10 straight games — by an average of 17 points — when the temperature at kickoff was below 40 degrees.

Last year, they were overwhelmed by the AFC’s best teams, losing to the Chiefs (twice), Bills (twice), Ravens and Eagles — some of them by blowout margins.

McDaniel needs to prove he can field a real two-way, tough team capable of standing up to the bullies of the AFC.

Kyle Shanahan, 49ers

The seven-year coach continuously stares glory in the face only to have his ribs kicked in. He’s lost two Super Bowls (to Patrick Mahomes and the Chiefs) and two NFC championship games. He’s coached up Mr. Irrelevant Brock Purdy to a NFC Championship Game and a Super Bowl.

But what is it about 10-point leads with Shanahan? He blew 10-point leads to the Chiefs in the Super Bowls and a 10-point lead to the Rams in the 2021 NFC final. If the Niners implode in 2024, the calls will grow loud to dump Kyle.

Sean McDermott, Bills

Is the problem the coach, the QB … or Patrick Mahomes? In McDermott’s seven seasons at the helm, he’s lost three times to Andy Reid and Mahomes. Josh Allen has proven to be both super clutch and super clumsy in crunch time, and you can’t get away with that against Reid and Mahomes. If the Bills can’t get past KC again next postseason, it might be time to shop for a coach who can overcome the Chief’ reign of terror.

Nick Sirianni, Eagles

It’s still hard to believe Sirianni survived one of the most head-scratching meltdowns in recent NFL history. After Thanksgiving weekend, Philly was 10-1 and on track for the No. 1 seed in the NFC playoffs. All that after a season in which they nearly had Mahomes and Reid dead to rights in the Super Bowl.

But in Week 13, they were crushed by the 49ers. Then by the Cowboys. Later by the lowly Giants. And finally by Baker Mayfield and the Buccaneers in the playoffs. There was talk that QB Jalen Hurts had leadership issues, that the locker room was a psychological mess.

Owner Jeffrey Lurie decided to stick with Sirianni. Let’s see if that pays off.

Mike McCarthy, Cowboys

Yes, he won the Super Bowl in 2011, largely thanks to the rise of Aaron Rodgers, one of the greatest QBs ever. But since then, he’s proven to be one of the most incompetent playoff coaches ever. Let’s look at the debris from past postseason debacles:

• 2012: Crushed 37-20 by the Giants after going 16-1
• 2013: 49ers QB Colin Kaepernick runs roughshod around the befuddled GB defense
• 2014: A fourth-quarter meltdown against the Seahawks in the NFC Championship Gmae
• 2015: A blown fourth-quarter lead against Colin Kaepernick and the 49ers
• 2022: With time running out, QB Dak Prescott scrambles for a substantial gain but in doing so kills off the remaining seconds
• 2024: In what has to rank as one of the most pathetic performances in playoff history, the Cowboys fell behind 27-0 to the Packers in the first half before losing 48-32 — and don’t be fooled by the 16-point margin.

Yes, McCarthy has been flummoxed by Prescott’s postseason incompetence, but how long is Jerry Jones going to stick with him as he pursues his first title in nearly 30 years. Jones doesn’t like losing in the playoffs … right??

Dennis Allen, Saints

The question must be asked: How does this guy even have a job? He’s 24-46 lifetime and has three seasons with double-digit losses. Granted, he’s had to work with Andy Dalton, Jameis Winston and Derek Carr — three of the most overrated QBs in NFL history. Maybe Carr will finally WIN HIS FIRST PLAYOFF GAME.

John Harbaugh, Ravens

The 2013 Super Bowl champion on this list? A man who’s won an average of 11 games over the past six seasons? The brother of national championship coach and new Chargers coach Jim Harbaugh?

Well … how many years is Baltimore going to squander one of the most talented QBs in NFL history in 2-time NFL MVP Lamar Jackson? He’s 2-4 in the playoffs under Harbaugh, including a total flop against the Chiefs in the AFC Championship Game. And that flop ended a Baltimore season in which they throttled the best teams in the league: 33-19 over the 49ers, 56-19 over the Dolphins, 34-20 over the Bengals, 38-6 over the Lions and 23-7 and 34-10 over the Texans.

The elder ‘Harbs’ is also entering his 17th season, so a dismal 2024 or another Jackson playoff exit could usher in a new head coach.

Mike Tomlin, Steelers

Pittsburgh is a franchise that has been incredibly loyal to their head coaches. They’ve had THREE coaches since 1969 — four-time champion Chuck Noll (1969-1991), one-time champion Bill Cowher (1992-2006) and one-time champion Tomlin (2007 to now).

Tomlin has had a very good tenure — winning and losing a Super Bowl. But despite his fiery us-vs-them and player-centric approach, Tomlin hasn’t done much since losing to Rodgers and Packers in the 2011 Super Bowl. He’s 3-8 in the playoffs over the past 13 seasons and has lost five straight.

Entering his 18th season, even Tomlin himself might see the writing on the wall.