Of the 170,000tons of gold of this world, the official sector only holds 30k~40k tons, the rest is held in private hands. Who are the "significant" or "substantial" private gold holders?
It is from this angle that I think this 1997 article is relevant.
You said: The power of old families like Rothchilds is finished ...
Morton said: today the family grooms the inaudibility and invisibility of its presence as a result, some believe that little is left apart from a great legend -- and the Rothschilds are quite content to let legend be their public relations." (The Rothschilds, Frederick Morton, 1962)