However, there is also the historical idea of the monarch needing to be a good one and keep up their end of the bargain. Interesting times ahead!
I believe it is in the tens of billions when a monarch dies (changes of money, ceremonies, etc). Dude is in his 70s.
Save your country a bit of money unless you want to foot the bill for maybe 10 years of being King.
That doesn't sound right by an order of magnitude. The main "cost" would be the extra bank holiday, but that is difficult to quantify.
Isn't it without a doubt that Prince George is next in line? It would take quite a lot to displace him.
If there are any disasters, making a 9 year old next in line to the throne voluntarily sounds like it.
So it would go all the way to Beatrice at number nine on the list. Most people don't even know who she is, so I think they'd probably call it quits.
Many monarchies have been elective[1], and in some, the monarch is often picked from the same family. Even that is a better system than "first-born child".
At least royals receive lifetimes of training for how to be a public figure and head of state.