The Preds this year and last were just a classic less than the sum of their parts team. On paper, where is the weakness? The roster has no glaring weaknesses. It's all in how they play as a team.
Pekka is taking some heat again for playoff performances, and that has been deserved at some points in the past (2017 Cup Finals in particular), but I don't see how that could be directed at him this year. He's the only reason they won Game 2 and Game 3, and he was absolutely hung out to dry via turnovers and penalties in Games 4 and 5. I thought he was fantastic last night.
I think you keep Laviolette, but clean out with his assistants and try and get Housley back. I will say that Lavy has a pattern at every long-term stop he's been at where he wins/makes it to a Final early in his tenure, then the team regresses, then their play really falls off after that and he's ultimately fired. It's uncanny:
Carolina: won Cup in year 2, then missed playoffs 2 years in a row, fired 25 games into year 5
Philly: made it to Cup Final in year 1, then lost in conference semis 2 years in a row, fired 3 games into year 5
Nashville: made it to Cup final in year 3, then underachieved in playoffs 2 years in a row...
I don't think Poile would make a midseason firing, but if the Preds miss the playoffs next year or limp into the playoffs and get quickly eliminated, I bet he's done. I do wonder, based on the team's play at various points this year, if at least some of the guys have tuned him out.