From an aussie point of view, I quite like having a basically powerless head of state, and a parliamentary executive, but I don't like the idea of King Charles-or King William, to be honest. Australia WLL be a republic in 20 years. The queen will die within that time and soon after that happens, we'll all vote for a republic-any republic, although i'd prefer a constitutional parliamentary republic.
Also, why would anyone care about Britain anyway? It's a dirty, smelly hole that was once powerful and now has been overtaken in every respect by at least one of it's colonies. (j/k, sorta).
And finally...Camilla will become Queen of one place in the world if it is not part of a republic by the time Charles takes the throne-Queensland. Sir Joh Bjelke-Petersen, the extremely rightwing former Premier of Queensland who in the 80s passed legislatin to add to the Queen's official title "and Queen of Queensland", which would (dfor some reason) be applicable to Camilla