This incident could easily have been avoided as there has already been discussions about putting the glass all the way around the rink (in front of the players bench). Nobody in hockey wants that because changing on the fly would be more difficult. Ease of changing lines trumps player safety. Is that Chara's fault too?
You're preaching to the converted here...
In any given year, there are players that come to a very abrupt halt when they collide with an open door into the box, people get high sticked, lose an edge and fall at high speed into the end boards or take a slap shot in the face while trying to block a shot.
Steps can be taken to remedy all these possibilities, but to make the game ultra-safe, maybe they change the game and only have tickle-fights at center ice to ensure that no one gets seriously injured.