it served a purpose 30 years ago, but it doesn't anymore. the notion that guys don't hit recklessly because of fighting isn't based in evidence or reality. fights happen after dirty hits, clean hits, and after no hits, it doesn't curtail anything. rule changes (targeting the head, letting up if you see numbers, mandatory helmets etc) are the catalyst for change. the idea that players want to keep it in is irrelevant. next time a cop pulls you over, tell him that most motorists want to speed and see how far you get. safety rules are there for a reason.
however, i will agree that officiating as a whole needs to be re-evaluated, with more calls coming from off-ice officials that can watch the entire playing surface. the game is way too fast for 2 refs to catch everything.
so they're on the decline, they serve no real purpose, but we'd better keep it in even though it is (by design) potentially devastating to a player's health. makes sense to me!