Depends what happens tomorrow
Holding only Yuan isn't necessarily going to save you from what's coming.
I completely understand the growing need to reduce the US dollar dependency. But these drawdowns should happen in an orderly fashion, with due consideration to addressing issues inherent in the old global financial order.
Clearly, in hindsight, being completely dependent on a single currency was one of those issues. It would be folly to replicate that environment with a different currency.
But the reality is that financial markets don't really have a soul, and just care about economics. By all accounts, the American economy is doing excellent right now and dollars are still in heavy demand.
Overall and overtime, that will weaken demand for dollar and what kind of trades other countries are willing to enter.
If it was some rounding error they wouldn’t have bothered spending money to set it up and get all the clearances.
(and yes, it does not mean that the US is entirely without options to hinder China trade, just makes things harder. In this case, a lot harder)
Indeed, it also acts as a counter balance/hedge against the US's demands in the future.
The problem for Europe is simply that we need to trade with both sides fairly openly or our entire economic model collapses - We are massively dependent on US technology and Chinese industrial capacity - too dependent frankly.
The bailout, July '46 - https://en.wikipedia.org/wiki/Anglo-American_loan
Loss of India (the empire's real money tree), August '47 - https://en.wikipedia.org/wiki/Partition_of_India
FWIW, "dismantled" generally implies a personal outside actor, with the intention and power to take things apart. Vs. the British Empire crumbled mostly because Britain's & Europe's relative power / prestige / image, post-WWII, were just smouldering ashes of what they'd been before WWI. That had obvious feedback loops with ambitious "native" leaders, nationalistic memes, and the just-won "moral crusade" to liberate Europe from evil Fascist occupation.
EDIT: The post-WWII revelations & condemnations of Nazi atrocities, plus how well the "yellow" Japanese had done against European/"white" powers, were pretty much fatal to (then prevalent) meme of white people enjoying "natural" moral and military superiority over non-whites. Which meme was an important foundation stone of most of the Empires which crumbled in the decades after WWII.