They're not interesting in the dollar as a store of value over the long term. They're interested in the value of the dollar as a medium of exchange today and for the future.
You've got the U.S. Treasury lending money at ridiculously low interest rates even while the country is $35T in debt. Who wouldn't consider that a huge success?
Many other nations have already bailed on the U.S. dollar because they see it as a disaster in the near future.
In 1971 the dollar was removed “temporarily” from being backed by gold. But it never returned as Nixon himself believed it would. Since then the dollar was essentially an un backed fiat currency.
Meanwhile other nations are dumping the dollar and buying up gold reserves.
Me, for one.
Crowing about having rapidly currency is a misplaced assessment and is only possible because it remains the most used reserve currency...for a while longer.