Kostopolous should be suspended however long Stuart injury keeps him out.
I would hate for someone who absolutely decimated a guy with a horribly cheap hit to the head get off free because the player that was hit just happened to miss 0 games.
Likewise, I would hate for someone to miss the entire season on a questionable hit that happened to concuss the player (with a bad history of concussions) for 82 games.
In theory, this is a good way to handle these injuries.
However, the NHL would still screw it up like they do regular penalties now. A player blatantly head-hunting and looking to do real damage would be overlooked, and a well-meaning yet competitive player looking to finish his play, like Kronwall, would end up out for weeks, the same way obvious slashes (ahem . . . see New Year's Eve game against Islanders) are not called but barely making contact with your stick on another player (Bert's penalty last night) is called.
Whatever the NHL does, not just in this case, it would be nice if they were consistent. They called so much attention to the fact they were going to "crack down on these blindsided hits," but they can't pull their heads out of their asses long enough to put together either an established layout for discipline or a better training program for the refs to more accurately identify these hits or both. I think because (1) the heads of the NHL are incompetent beyond belief and (2) it is such a subjective type of penalty that it will be a while before things are satisfactorily worked out and resolved.
Either way, best of luck, Stuie! We wish you a very speedy recovery!