CT Lawyer – actually it is settled that Camillia would be queen consort if Charles becomes king (i.e.outlives is mother, which isn’t certain since women live longer than men and the queen was relatively young when Charles was born). A problem with her using the title of “Dutchess of Cornwall” is that Charles daughter in law inherits that title. Of course parliament can juggle the line of succession , and change titles, and has done so quite often since the 15th century.
Also, note that adultery by a male member of the royal family has never been a problem. Indeed, many have suggested the real reason Edward VIII (Duke of Windsor) was forced from the throne was his sympathy with the Nazis (which is also why he was “stashed” in America during the war, to make sure he didn’t try to become the Quisling of occupied England).