Interesting because most modern takes on vampires don't use the "destroy the head vampire and they all die" angle.
It used to be a ferquently used part of the myth.
I think Klaus wasn't just telling Stephan "I gave you someone to hate"...he was speaking to the audience. But it's backfired, I hate him and find him an utter bore. Good villains make you want to see more of their dastardliness.