In 2013 the San Franciso 49ers went to the Super Bowl. Despite going down in the first half, they staged one of the greatest comebacks in Super Bowl history before heartbreakingly failing to convert on a 1st and goal from the seven-yard line and lost the game 34-31.
In 2014, head coach Jim Harbaugh was hired by Jed York because they couldn’t get on. We knew at the time that it was a massive mistake, and now we have the numbers to prove it.
Here is a graph showing the 49ers win percentage. I’ve also included the win percentage of the Michigan Wolverines, who Harbaugh went on to coach after leaving the 49ers.

You’ll notice that we’re not doing very well until 2011 when we hire Jim Harbaugh. Things turn around instantly and for the next four years we not only make the playoffs but make it all the way to the championship game (and once, the Super Bowl). In 2014, we go 8-8. Not great, but not a losing record either.
Harbaugh is fired and we go through three head coaches in three years: Jim Tomsula, Chip Kelly and Kyle Shanahan. All of which are losing seasons, and we’re losing this one, too.
Meanwhile, Michigan, who, to be fair, was never a bad team, go from inconsistent results to having a winning season every year under Harbaugh.
In fact, the 49ers have never had a losing season under Jim Harbaugh. Neither have Michigan. Can we have him back yet?