This is the third article I’ve read that predicts that a financial crash with occur in the US once the dollar is no longer the international currency of choice.
IMHO the US dollar will not crash rapidly unless an unforseen crisis erupts. The US dollar is widely used and well institutionalized in fiance. China is chipping it away by having Japan, Russia and other nations settle trade with yuan. China is also building up her gold reserves. Last official number was 1100 tons several years ago, but experts think she may have up to 4000 tons and accumulating at 750 tons per year. China wants to have 8000 to 10000 tons. While she is spending time buiding up her gold reserve, she is also using that time to gain experience on using the yuan internationally.
As the US keeps devaluing the dollar by printing, China when ready may back her yuan with gold. That can be a game changer in trade. A foreign nation has a choice to use US dollars that may lose value overtime or use yuan backed by gold. Even if the yuan does not replace the US dollar but available as a second alternative, the US dollar and US financial power is degraded compared to the present. Think Britain after WW2 when the US dollar replaced the British pound. Worth reading on what happen to the British middle class during that post WW2 period. That may be the fate of the US middle class in the future.