I think Bitcoin has grown so big that at this point, Bitcoin is the only thing that could destroy Bitcoin. I am not against forks (and I am not supporting it too) but I do see that if we don't put our efforts into improving Bitcoin from user's side, developer's side and work on the current issues in order to resolve those issues then we don't need anyone to destroy it for us. I don't see any external factor as strong as internal factors having the capacity to destroy Bitcoin, to be honest.