problem is always gonna be as long as the NHL allows those hits as legal that's what's gonna go on. Everything Trouba did was textbook...elbows down, step up and lower the shoulder. The sticky part is always being the other guy being in a vulnerable spot because of his own positioning and ignorance, the hit mechanics itself are "fine".
I don't like players getting hurt but it always kinda goes back to "how do you police the game and allow hitting but not THAT kind of hitting", because in no way does Trouba go into that targeting someones head intentionally, this isn't matt cooke (or previous incarnations of trouba!) with a flying elbow to the head, it's a textbook check but if it's illegal than no player is ever gonna know if they try to step up and hit someone else whether they maybe get chest/shoulder or they get the other player in the head because of how fast the game goes and the dynamics.
So yeah...you come down to are we going to allow open ice hitting or not?
And dipping into the blaming the victim pool here but godddaaaaaaaaaaaaamn how do you pull that shit on Trouba's side of the ice