On the one hand, I agree that the league has done too little too late to address the problem. People who have had repeated concussions get a reduced life quality, are at high risk for Alzheimer's and Parkinson, and often die several years too early. My dad, who played chess at a fairly high level, suffered a concussion in the 80's, and it took him ten years to get back to the same rating that he had before the concussion. Says something about how it damages the brain. A female collegue of mine is married to a former hockey player, who played professionally in Germany's top league and had his career ended by concussions. He got the first one in a game, then a second one as he was practicing to return, a team mate ran him into the boards during practice...
She's said that in hindsight they should have sued him. In part for being an idiot and an asshole, but mainly because there is no reason or excuse for running a team mate into the boards like that during practice, and especially not one who has recently had a concussion... He couldn't do anything for two years. Constant head ache, couldn't focus, no energy. They had just had their first child, and she had to support them by working while also fixing everything at home. He had quit high school to focus on hockey, now his career was over, and no, a couple of years in the German DEL league does not mean you're set for life. His better now though, after two years of just being sick, he went back to get his high school diploma and now he has just finished law school and gotten his first job after hockey.
So yeah, concussions are a bitch, and hockey needs to do everything possible to prevent them. And you may recall that I've been bitching for years that the NHL needs to ban head shots. They finally did, but they're still not good at enforcing the role in a consistent and predictable way.
On the other hand, the players knew what they were getting themselves into, and the main reason (apart from some arenas using glass instead of plexi) players get concussions are other players not showing them the respect they should. Bobby Orr claims concussions were rare when he played, and they didn't even have helmets.... He says the difference is that back then you always checked shoulder to shoulder. You didn't place your shoulder in another players face. And, yeah, he claims you can avoid that. Perhaps not every single time, but as a rule. Thus the players, as a collective, at least in part have themselves to blame.
That being said, when a teenager or 20-yo gets a shot at playing in the NHL, they don't think about getting injured for life, they just want to play the game and be the best that they can be. The league does have an obligation to make sure these kids can play he game without risking their life.