That's more-or-less how the line of succession works back home. However when a Queen loses support they're almost immediately succeeded by a Prince or Princess. Literally it seems like the only purpose of the royal family is to keep the queen on her hooves. From what he has seen of the Equestrian monarchy, the fact that Queen-erhm Princess Celestia has maintained the fear and adoration of her subjects is an immense testament to her character. If she could dim the sun, though, that would be nice. What is it with ponies and light? Don't they realize it makes them vulnerable? So uhh...why hasn't anyone overthrown the light-ah, I mean the Royal Family already?