But when the US did this it was very different because with Bretton Woods we had already established the USD as the global currency to be used in international trade and settlement everywhere. So countries were unable to move away from the dollar as fast as they could other currencies. And in the interim we started setting up the Petrodollar to prevent them from doing this - by making it impossible to buy the most in-demand commodity in anything other than USD - making fighting against the dollar futile.
But one of Biden's many 'accomplishments' was pushing Saudi Arabia far away enough that they chose to not renew the 50 year Petrodollar agreement, which ended on June 9th 2024. This means now that the USD is completely and absolutely free floating with no backing, indirect or direct. And you can see this in which currency countries are holding as a reserve currency. [1] Just before Bretton Woods it was about 85% USD. It then plummeted (after the Bretton Woods default) and then bounced back to reach a peak of 72% in 2001. It's now down to 57% (Wiki table has not been updated with latest numbers) and continuing to steadily decrease.
As soon as a viable alternative currency emerges, the USD will collapse - and this entire economic system alongside it. Trump's ideas aren't so much radical as he is simply saying the quiet parts (probably as a result of intelligence briefings) out loud. This entire thing is why he's threatened 100% tariffs if BRICS countries try to replace the dollar. Of course tariffs from what would be a collapsed economy have far less weight behind them than e.g. the lack of access to oil. So the interesting times we live in are certain to continue for the foreseeable future.