If we change the coach and nothing else, it won't be long before he says "man, this team sucks" and goes the AV route of trying to score 6 goals on 7 shots but we're 36th in corsi, goes the Gallant route of playing quaalude ass hockey and getting shut out every other night, or goes the Quinn route of doing either of those depending on how he feels that week.
He'll also be the third straight coach to give Lafreniere and Kakko a look and go "welp, this ain't it."
I would love for it to be as simple as a coach coming in a changing the culture but I just don't believe it.