Weird, pop storyline:

Saudi Arabia is considering accepting yuan for oil. BRICS is building alternative payment systems. China and Russia are settling more trade outside the dollar. Central banks are buying gold. Therefore, according to the story, the dollar’s days as the world’s reserve currency are numbered, and when the petrodollar finally breaks, the entire global financial system will be turned upside down.

I mean, if we squint, there's a slight downward trend in the dollar share

Also, importantly: accepting a currency in trade (for whatever good or labor) is largely irrelevant... what matters is what you hold in between production and consumption, i.e., money demand.

Nearly 90% of all foreign-exchange transactions involve the dollar. Strip out every dollar currency pair and what’s left is remarkably small. Euro crosses with other currencies account for, at most, roughly 8% of global FX transactions. All remaining non-dollar, non-euro pairs combined account for only around 2%.

oops, dollar dominance ain't going nowhere...

The supposed collapse of the dollar system is being predicted while the dollar remains involved in nearly nine out of every ten currency transactions, holds a commanding lead in global reserves, and has no identifiable currency gaining enough ground to replace it.

Rule Britannia, Britannia rules the waves!

Before World War I, the British pound occupied roughly the position the dollar occupies today. London was the center of global finance, Britain possessed an enormous overseas commercial network, and British banks financed trade across much of the world.

cute lil map

Britain had accumulated this position over the nineteenth century as the world’s leading industrial, commercial and financial power. Even as the United States and Germany caught up with Britain industrially, London’s financial network remained extraordinarily difficult to replace.

World War I was an unmitigated disaster: the unnecessary war.

When war broke out in 1914, Europe suddenly needed enormous quantities of food, commodities, weapons and industrial goods. America could provide them. Gold flowed across the Atlantic to pay for American exports. European governments increasingly borrowed from the United States, while Britain began liquidating foreign assets to finance the war.

TL;DR:

You might not like the Iran conflict, but it certainly is not World War I. There is nothing comparable to the monetary transition of the early twentieth century happening today. The dollar remains globally dominant, and there is no rival equivalent to the United States of 1914: an isolated, secure, free-market superpower with an economy more than twice the size of the incumbent reserve issuer, AND rapidly developing the financial system necessary to challenge it.

and:

Instead, governments, institutions and individuals could gradually increase their holdings of scarce monetary assets such as gold or bitcoin while continuing to use dollars for trade, credit and financial settlement. Eventually, those assets will become important enough to play a formal role in the monetary system.