Harry, despite all his faults and his big mouth etc. is the only one of the lot of them I have any time for. And I don't really care about him at all, but in the spirit of the RF sagas well.... He was the only one who had the balls to get out and live some kind of a normal life, such as it is with privilege and wealth (and good weather!) and so on.
As for the rest of them, they are way beyond their sell by date now. KC to me, appears to be terrified to lift the lid on anything. I'd say he's shitting himself at the thought of the edifice crumbling and perhaps being implicated himself.
He could lose the rag and do something drastic. I think I recall a spot or two of devilish temper with pens at his ascension to the Throne. He has it in him but it's probably just too much to contemplate right now. We can excuse him somewhat due to his illness, but he looks OK to me (I know looks can be deceiving), and plenty of cancer sufferers continue their lives during and after treatment. He is only 76, which is not ancient by today's standards, and his life of privilege has helped him age well (apart from the cancer).
So let's see who's left to serve when W takes over. Himself and the missus, Anne ( if she is well and hearty enough), Eddie and Sophie. That'll be some slimmed down monarchy alright, but not by planning, just because they are all that's left! Unless I've forgotten a bunch of unknowns. The Wales kids might be old enough to cut a ribbon or two also by that time, but if they have any sense they'll go off and do a gap twenty years and never come back.