If Prince Charles succeeds his mother as King of England and Great Britain ... well so be it. There have been a lot more controversial figures to wear the crown in the past. Still, if the UK cannot countenance Charles, then he should abdicate in favor of his son Prince William. That's my 2 cents on the matter.
As far as deciding whether or not the United Kingdom should keep their monarchy or not --- that's 100% up to the people of the United Kingdom I say. They are smart people, they'll figure it out for themselves.
"It is well that war is so terrible, else we should grow too fond of it."
- General Robert E. Lee
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"It takes a big man to admit when he's wrong. I am NOT a big man." -Chevy Chase