Sorry, but no.
I mean, on the one hand, sure, eventually _something_ else will displace the US dollar as the world's leading reserve currency, because that's how history works: nothing stays in a dominant position forever.
But the statement you added "yet" to was much more specific. And no, Communist China's ridiculous "dedollarization" propaganda campaign is not going to have any measurable impact on the dollar's dominance, any time soon. Among other things, the RMB has never been anywhere near stable enough to make it into the top five currencies, and as things stand now, it looks to only be getting worse. It's relatively heavily traded, but it's not stable, at all. (Contrast with, say, the Canadian dollar, which is stable enough but nowhere near heavily-traded enough.)
The further into the future you try to look, the more difficult it is to see clearly, but if I had to predict based on what we know now, I'd say the currently-existing currency that is most likely to eventually unseat the US dollar would probably end up being the Euro; the Pound Sterling and the Japanese Yen are potentially also in the running. History is seldom predictable, and it'll probably end up being something we cannot forsee right now; but even something like the Brazilian Real, has a much better shot than the RMB, which will never be stable with the CCP in power, and probably cannot survive the CCP's collapse.
As for gold, that's not new, at all; we know what its role is, and that isn't changing. People have always turned to precious metals as a reliable store of value whenever financial times are tough. And that generally works except when new technology messes things up (e.g., what happened to the price of aluminum when people figured out how to do high-temperature electrolysis). For gold, the most likely new technology to mess it up would be if somebody managed to devise an energy-efficient way to extract the dissolved gold from sea water; but even then, gold would still be a precious metal, just not quite *as* precious as it is now. (The total amount of gold in the oceans, is only a few times the quantity of gold in circulation, and less than the amount of silver in circulation.) Short of affordable transmutation (which would be *much* more disruptive than just lowering the price of gold), I can't think of any other way to turn gold into a base metal like aluminum.