People always exaggerate the impact of geopolitical things, because it feels like the biggest thing ever, especially when you're relatively young. But in reality we're always onto nonsense after nonsense. Countries have the wisdom and view to appreciate this, and so respond to geopolitical stuff (in action, not rhetoric) far more gradually than people do. They're certainly not going to just dump all their dollar reserves because of a single misguided war or even misguided president, or they'd have been gone long ago.
[1] - https://en.wikipedia.org/wiki/Reserve_currency#Global_curren...
[2] - https://en.wikipedia.org/wiki/Bretton_Woods_system#Nixon_sho...