Remember, on a Scy Fy Show, NOBODY Has to Die 'Forever'
Nobody. Vampires or wolves, or the "chosen". Remember the Spock's resurrection, the interleaving of the scene we didn't get to witness when he bit the dust in the previous Star Trek motion picture?
There's always room to come back, especially for the supernatural creatures.
"Even a man who is good at heart, and says his prayers by night, may turn into a Wolf when the wolf-bane blooms, and the moon is full and bright. The world is thorny through no fault of your own, my child.
Now rest, sleep for now."