She will be dead soon and then what? I am wondering if they have someone suitably evil enough to replace her.

@John Doe My understanding is that Prince Charles will not become King.

@John Doe I would definitely agree with that but when a family owns 6% of the Earth's entire surface area that is going to be met with resistance. I think the reason Charles won't become King is that his marriage to Diana wasn't approved (and you saw what they did to her). When you're part of the Devil's cult you only marry Devil's cult members.