Oh man. Let's begin.
There are two problems with fighting from a marketing standpoint:
1) It's this super quirky part of a beautiful sport that defines the sport for many people. Some people who aren't fans like it (only thing I like about hockey is fighting), but they're not serious fans. But overall it makes the league not look serious.
So one of your two arguments for why fighting is problematic for marketing hockey is that many people find fighting integral to hockey, but that the league doesn't look "serious" because of it.
This is ridiculous. Many people currently that watch hockey like fighting and big hits. As you even point out. These things are a boon for marketing hockey.
Every other sport there are real repercussions when it comes to fighting. As is it makes the league look bush league. It's like your friend that says silly things all the time. He's lovable but no one takes him seriously.
You've equated fighting in hockey with a person who says "silly things" to prove it means they're not taken seriously. This isn't an argument. Is this what you think marketing is? Saying silly things is obviously silly, but fighting in hockey is not obviously unpopular.
2) 99% of fighting is clean and these guys respect each other. That said when you promote fighting it creates a culture of violence where dirty plays end up being overlooked because it's not that much of a leap to dirty play.
This is another assumption on your part without any evidence. There are plenty of players who fight regularly or even infrequently but would never be considered dirty.
Where dirty plays are being overlooked, that is the issue. Trying to throw fighting in as the reason the DoPS didn't give Wilson proper discipline is disingenuous and incoherent.
Kind of like in politics things tend to go into extremes more and more, even if they start center left or center right. And that's what creates the DOPS giving a guy a $5k fine for dangerous actions. Once again bad marketing, makes the league look completely bush league.
This is your entire argument - without zero evidence or reason supporting it, just assumptions. This could have been the entire post.
If you want the NHL to grow you need to get rid of unnecessary violence and promote tough physical forechecking hockey instead. Because that's actually part of the game.
"And, in summary, I have provided no evidence or logic, but feel very strongly that fighting needs to go"
Many hockey fans feel fighting is integral to the sport. That's not going to change with any new generation or demographic.
I've tried not to "flame" but I think you've not really provided any sound reason that fighting is limiting the NHL's marketability.