The avalanche of gold that fled the Second World War is going home.
This is a return to a more 'normal' currency regime, and a move towards monetary autonomy in the aftermath of the of Bretton Woods era.
In the post-Bretton Woods II era it appears that independent regional currencies may predominate.
Unless of course the nations can forge a more equitable agreement for an SDR-like clearing currency for international trade that is not dominated by any one nation or group of nations.
And the times, they are a-changin'.