Quite. Do people think these building would collapse if some prince doesn’t live there. Plenty of independently wealthy folk who would but them and pay for their upkeep without bothering public coffers.
Royal family are total spongers . Burn them out.
Keep the magnificent buildings and parks. Give them back to the people. Nips will still come and take endless pictures of the buildings thinking Liz is in there feeding caviar to her mutts.