Maybe they should have spent a bit more time learning about yellow cake uranium and Niger over 20yrs ago when the most recent bleeding of US treasure started.
To be the world's Reserve Currency and the stay the Reserve Currency requires the continuous spending of copious amounts of money. They can make the choice to give up this mantel and pass it along to the next contender as is the process of following world history. Or, if they like, they can try Door #2 and attempt to black mail the rest of the western world into following their lead, to keep the music going, and have us spend our money with theirs in keeping the gig from being up for another decade or two.
During that time period, the next 1 to maybe 2 decades, they better hope that China self-implodes, effectively removing themselves from being the next contender.