Absolutely. The hope is that the need for stablecoins to hold reserves in the form of USTs could keep the petrodollar afloat a little longer.
Until recently the UK and Japan have been taking up some of the slack caused by China and others ditching USTs, but the UK and Japan have been pushed to the limit and have their own problems.
The US petrodollar empire is on the brink of collapse.

It doesn't, but it cooould — since they're an important source of marginal UST demand