If the US becomes insolvent, that would severely impact the USD. But other currencies will not try to follow the USD, there would be no point in that. The USD would just lose more status as an anchoring point. The US is also not a major oil exporter, so presumably most oil will trade for other currencies, rather than try to sell for an inflationary currency.
In short, if the US becomes insolvent, the rest of the world will largely ignore what happens in the (at that point) 8th economy in the world, and mostly try to untie their economy from it.
In short, if the US becomes insolvent, the rest of the world will largely ignore what happens in the (at that point) 8th economy in the world, and mostly try to untie their economy from it.