China, Russia, and India have cut deals in which they agree to accept each others' currencies for bi-lateral trade while Europe, obviously, designed the euro to be a reserve asset and international medium of exchange.

These were challenges to the dollar's dominance, but they weren't mortal threats.

What's happening lately, however, is a lot more serious.

It even has an ominous-sounding name: de-dollarization. Here's an excerpt from a much longer article by "strategic risk consultant" F. William Engdahl:

(Global Research) – China, increasingly backed by Russia—the two great Eurasian nations—are taking decisive steps to create a very viable alternative to the tyranny of the US dollar over world trade and finance. Wall Street and Washington are not amused, but they are powerless to stop it.