Pretty much this. There is no “spare part” currency to swap in for the dollar and preserve the modern economy, here. The end of dollarization means the end of post-WW2 economic policy wholesale.

So what we’ll end up with is a post-WW2 supply chain but in a world where every currency dynamically floats, even the dollar. It’ll be a decade of price shocks, trade wars, and likely conflict as everyone vies to define the next era of economic power, until a smattering of core currencies (likely the Yuan, Euro, and Dollar) emerge on top for each respective region.

That’s my armchair theorycrafting, anyway.