The thing a lot of people forget is that fighting is already illegal. Making it more illegal won't stop it. The best hockey brawl caught on camera happened in the IIHF World Jr's where fighting is more illegal than in the NHL.
Even with the more modern day knowledge of CTE, it's not going to eliminate fighting. It may lead to a rise of other injuries because of the disconnect between cheap/dangerous play and the punishments for cheap play. I think it's going to take someone ending the career of a player like Eichel, McDavid, Toews, Kane, Crosby, Stamkos, etc. via a cheap play before the leage starts to end careers for ending careers, and I do believe past "lawlessness" served a purpose. Back when real enforcers didn't let things like linesmen holding them back stop them for pummelling someone who went after a teammate, there were a lot less Averys, Cookes, and Torres' in the league. Why? Suspensions don't come with a high dose of pain and sutures.
That being said if the league clamps down more of fighting it ill start to eliminate worthless slugs from the lineup that do nothinbg but fight, but IMHO it's not going to eleiminate the worthless slugs that do nothing but cheapshot until the DoPS starts permabanning these fucktards.