SPN: Werewolves?

Re-watched Night Shifter, 2.12, and we get this comment from Dean about shapeshifters: "You remember the old werewolf stories? Pretty much came from these guys. Silver's the only thing I've seen that hurts them."

Does that mean at this point the writers intended to have no actual werewolves in the SPN verse? Because if so, that only lasted five more episodes.