The fact that this happened on a clean hit according to the current rule book to a guy with, to the best of my knowledge, little to no concussion history, should open some eyes around the NHL. The game has gotten faster over the past few years and it will only get faster.
Things can't remain the same. You either let the guys slow each other down, or you change the rules. I know this probably won't be a popular opinion but the thing is, the NHL will end up with massive legal trouble soon if more players end up with the same fate as Geoffrion.
With that said, I feel sorry for Geoffrion who spent his whole life trying to make it to the NHL only to get his dreams crushed this way. I hope he finds something(s) else to make him happy. Good luck to him!