I do feel sorry for the BIPM. They had one of the most important buildings in the world for over 150 years, even the Germans respected it when they overran Parris in 1940. Now the building and its contents are irrelevant. Any lab anywhere in the world can produce an accurate kilogram (which is the entire point of this redefinition).
I wonder what will happen to the IPK? Will they just chuck it in a skip or will it get displayed in the French equivalent of the Science Museum?
Interesting that the Kg is still based off a prototype, when it's basis is derived from a volume of water defined from the Metre.
And the Metre has been redefined repeatedly due to improving abilities to create a more accurate specification from which the distance can always be created from.
The ultimate kick in the teeth for those that like the old English Imperial system that took over the empire and off shoots, is that they are now also defined from the appropriate Si units...