A Rouble still buys more than a US cent. Hang on to that victory if you can.
Meanwhile, nations are lining up to buy Roubles... not. Even China doesn't want them. And they recently got the RF to accept Renminbi and then weren’t interested in exchanging those for goods.

As to whether some other currency might replace the US Dollar, that’s more complex, but it needs to be something all trading partners agree has value, and to the extent that it stays a fiat currency, it needs to be fiat from a country so little dependent on international trade that daily changes in relative value don’t affect its internal markets so it has little reason to try to manipulate it. The Rouble does none of that; the Renminbi is a perfect example of a manipulated fiat currency. There may eventually be some other store of value that replaces the USD, but it needs to be expansible; things like gold just won’t do it; check Liquat’s “Bankers who Broke the World” for what happens when the world sticks to non-expansible stores (gold / silver).

Way too much response to what’s probably a troll in Petrograd parroting some talking points.