MikeH

Answer: It would be rather difficult for the small number of vampires that exist to kill six billion humans. Even if they could, they would be eliminating their food supply. As to the Volturi, it's unlikely all three would die and at the same time. It's probable that a line of succession is in place to replace them. There are other vampires working within the Volturi organization that we don't happen to see.

raywest ★

Answer: Renesmee is not immortal, but will live an extraordinary long life and she will age slowly. It was never revealed if half-breeds can succumb to human ailments. Considering half-breeds are extremely rare, it's unlikely anyone knows.

raywest ★

Answer: The werewolves in the Twilight series are Quiliute Native Americans who mostly live on their reservation, have their own school, own legal system, etc. Being as it's a rather cloistered society, it would be easy for certain members to generally go unnoticed.

raywest ★

Answer: If, in the future, Renesmee left, Jacob would have to accept that, regardless of whether or not he was emotionally hurt by it. Because he imprinted on her, he is bound to abide by her needs and decisions.

raywest ★

Answer: Aro also makes the argument that for the first time in our history humans pose a threat to our kind with their weapons that can destroy us. Theoretically any weapons that can tear apart and/or burn the vampires would work. So, yes, things other than vampires and werewolves can kill the vampires and werewolves.

Answer: Sure. The problem is that these films portray vampires and werewolves as having super-human abilities, so it'd be significantly harder for a regular person to kill one. But nothing about the films seems to indicate it's overtly impossible.