This is such a thoughtful post @FlorettaB
In a way, H and M have done William's children a favour, and one hopes conversations will happen about the two youngest children.
The nub of the issue is that the UK has a constitutional monarch, one person.
But that monarch comes with a whole bunch of extra people who constitute a "royal family", supposedly supporting the monarch, but really just providing fodder for the press, particularly the women who marry in.
In that regard, a slimmed down monarchy is the best way forward but I believe it should be slimmed down only to the monarch. The heir can train the background, and all others make their way in the world. The spouses of the monarch and heir can play supportive roles, but should be free to work elsewhere if they wish.
The patronages thing is a fig leaf, charities in other parts of the world work perfectly well without royal patrons, and they can learn from that.
So let the monarch do his constitutional duty, alone, and dispense with the whole Royal family stuff. It will definitely kill off all the drama.