Am I crazy to worry that moving away from Julien's system will lessen the impact Bergeron has on the game?
I think you are. Any coach would KILL to have him... Any coach would KILL to have a player who does half of what he does on defense alone. Any sane coach will capitalize on what he does.
I'm never worried about Bergy. If he's not producing, it's because of something out of his control. And he always comes back with a vengeance.