It cant, you are the idiot.
Oh yes it can. And it has in the past.And it will again
because of succession laws.Camella is a closet Roman Catholic.
Succession is governed by the Act of Union 1800, which restates the provisions of the Act of Settlement 1701 and the Bill of Rights 1689. These laws restrict the succession to legitimate descendants of Sophia, Electress of Hanover, and debar those who are Roman Catholics or who have married Roman Catholics
(Camilla Parker Bowles is supposed to be Anglican and not Catholic. She is however regarded as a Catholic because she married her first husband in a Catholic Church.)
Charles is easily disposable, the way to do it is readily available should the need arise.