If any of the usual gang of idiots behind them gain some consistency, the Bruins will miss the playoffs handily. But that's an if. Sabres and Sens can't string anything together (not surprising given I have experience with both of their coaches from last year), and the Red Wings and Habs are just bad.
With that said however, they can just as easily go on an extending losing streak and see themselves out in a hurry. Their offense is beyond anemic. It turns out when you have only one legitimate scorer, it's pretty easy to get shut down. Elias Lindholm is not even close to a 1C but is being paid like one. I don't really know about their defense, but their goaltending is also bad. Swayman didn't get prepared for the season before his big deal and it shows, and their backup is FourPastSalo.
My money is on "they're gonna miss the playoffs" but the Atlantic is already such a spectacular shitshow beyond the other three perennial contenders, and that's being generous. Still, I don't think they have the horses.