I can see Treliving trying to do roster surgery that will just lead to a worse version of the Panthers, while the league meta moves onto something else.
That was quite literally what happened to the Canucks after 2011, where management insisted the team needed to be bigger and heavier in response to losing to the Bruins, yet they just ended up too slow and quickly fell from the top as they aged. The Kings were better at playing a heavy game, the Hawks kept winning with their skill (beating the Bruins two years later, to wit) and even the Sharks ended up well ahead.
The truth is that there's never one "right" way to play. The roster needs to be evaluated holistically and coaching needs to be on the same page as management. The Panthers know how to find guys that fit the style they want to play, because they know not just to scout the traits they're looking for but they're also aligned with their coaching staff as to whether these players would thrive in their system.
Maybe the Leafs just needed to be a bit faster, and they wouldn't have been pinned down by the Panthers forecheck as often. Or they needed better shooters, so they capitalized on the breaks they created more often. Bigger, scrappier guys who could've handled the aggression better, why not? Or did they just need some guys with that je-ne-sais-quoi to see through the pressure?