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He's been waiting to be King forever, so I can't see him giving it up anytime soon. Some said it would skip him to go to his son Prince William but they don't understand the power of the rules of succession, they are not brushed aside lightly. James had to go because he was a Catholic and Edward VIII had to go because he was a Nazi!

I am pretty sure King Charles III will not give up the crown till his last dying breath.
But i do believe he is going to give up his air addiction quite soon.