When the petrodollar stops being reserve currency all those monies are coming back to flood the US homeland...In addition, I don't know what its supposed to accomplish, more control and monitoring of the currency? Don't they already have a system in place to track transactions and balances? Its going to be the same, where countries intentionally avoid these digital dollars because they don't wanna get tracked, then suffer sanctions and fines.
Digital currency for China is more useful, because this allows them to track possible money laundering, prevent capital flight, and it gives them more data on where the money/investment is flowing. With these benefits, they can now safely allow foreign ownership of RMB, and now it depends on the laws and regulation they will apply and the incentives they will use to encourage the use of it.
America is going to give the rest of the world the finger by setting up a new digital currency and doing a one to one mapping of existing dollars to new digital dollars for US persons and US firms and institutions and then tell the rest of the world who is still holding the traditional dollars to go pound sand