If he plays at all before next October, it is too lightly. He is a repeat repeat offender, and he maliciously swung his stick at a guy's head. If that doesn't get you suspended for the rest of the season (regular season AND playoffs), I don't know what does.
My brother often tells me that the NHL is a garage league, and when shit like this happens, it is hard to argue with him. I love hockey, but wish the NHL would do something to eliminate this kind of crap.