Another thing i meant to mention...
Its hard to compare whats happening in other sports because who knows who is right? With concussions the effects are often down the road. In 5 years the NFL could be saying the NHL did it right and we should have taken that approach.
They could also come back in 5 years and say the NHL didnt need to take that approach. Its something we will probably never know because the current and long term effects of a concussion arent easily measured like a broken bone or sprained ankle.
That doesnt stop us as fans of making the comparison because we can.