My goodness
One of the Nine, that is a conclusion rife with despair. It pains me to think that it could end that way. I suppose that it is in keeping with the melancholy of Tolkien's legendarium though.
Can you tell us which people foretold this final doom of Wargs? Probably Men I would think, they are always thriving on the tales of dastardly Wargs.
Edit to add;
Diamond, that is either a hoax, or a very unfortunate coincidence!