That's true. American giant Ponzi scheme and the economy will last as long as they could print enough new money out of thin air to repay old debts, they don't need any other injectors of liquidity. The FED alone is enough, it prints and then buys everything, government, corporate, and municipal bonds, and possibly even helicopter money in the future, injecting liquidity into the economy, without causing ultra hyperinflation.
And that can run as long as there is demand for dollars abroad. The dollar is the key, not the foreign holders of US Treasuries, maybe the foreign holders of dollar reserves are more important. But the rest of the world, 85% of the human population is slowly ditching the dollar too and will trade in their own currencies alongside throwing them out of their CB's foreign reserves. They have no fear of collapsing America anymore, and neither do they have any positive emotions toward it. Why should they keep the Ponzi running?
There is no reason why they should all be paying the cost of American inflation, for fat and lazy Americans to enjoy their wealth and even sanction them all while telling them how they are "shitholes" because they don't support enough LGBTQ+ rights and don't have enough "freedoms".
At this point is better for the world to feel short-term pain from the financial system collapsing, and the dollar collapsing, than to feel long-term blackmails, threats, and sanctions, from Americans who don't understand that the world is giving them a favor by using the dollar, and allowing them to be lazy and do nothing cause of that, it's not the other way around. They get more value if they trade in their own currencies. The dollar became the global currency because it had gold to back it up, but now they have nothing to back it up. Even the petrodollar system is ending.