What's more realistic; That Mike Sullivan is singlehandedly holding back an otherwise still elite team that would be cruising to wins and on its way to another Cup Finals appearance, or that the issues are numerous and while Sully is a big part, he's not the only factor in this team's steady and dramatic decline?
The FO and ownership don't care enough or are incompetent when it comes to addressing issues and making changes. Goaltending is awful. The core are over the hill. The supporting cast are not good enough to pick up the slack. The revamped and still exceedingly expensive blueline is still mediocre at best. The team has very little cap wiggle room or valuable assets to use in trades to acquire legitimate help. Sullivan's TOI distribution and line combos are f***awful.
It's lazy and convenient to place the blame entirely on Sullivan. He's part of the issue, without question, and I've been calling for him to be fired since the Habs play-in, but he's far from the only problem. If anything, I expect the FO to be completely nuked if the team's still struggling mightily by Christmas or New Year. I think Sullivan's safe for the rest of this season at least because of his contract(s), and I'd be surprised if he didn't last as long as Sid, maybe longer. At this point, just shrug, who cares? Save yourself a lotta grief.
-edit- Sure, the billionaire group of douchebags who own the team now have enough money to eat Sullivan's contract(s) and not really notice. But billionaires don't just throw away tens of millions of dollars on a whim. Hell, I'm still not entirely convinced that FSG bought the Penguins specifically to own a successful NHL franchise as much as they bought a huge real estate opportunity in downtown Pittsburgh that just so happens to come with an NHL team like the toy in a kid's meal.
They didn't chuck a billion down on this team without knowing full well they were three consecutive 1st round exits deep (at the time of purchase, four now for those at home keeping count) with a core in the twilight of their career and an arena struggling to sell out for a while now. That's not the kind of investment you make without a huge factor outside of the hockey side of things.