(The cause for optimism is that even this lasted only 15 years before the elites shot themselves in the foot with the 2008 crisis. The system really is doomed.)
Couldn't the plutocracy merely have the U.S. Federal Reserve system accept and issue the Federal Reserve Note II (i.e., a new one) instead of the Federal Reserve Note?
If they devalue or abandon their FRN I, which amounts to: 1. acknowledging their previous note issue was a flawed system; 2. in effect reneging on their debt or at least most of it; 3. stiffing the very people who trusted them; 4. causing a crisis and mass spectacle that generates lots of commentary that exposes the system's fundamental weakness; 5. trying to get a new system going to maintain their power, that people will now trust, I think they will want to make absolutely sure the new system has enough strength to withstand all skepticism, at least initially. We have to remember these people are pretty smart.
That is why if they peg dollars to gold, crypto, etc., it will be at a very low price for the dollar. They'll need all the stability they can get, and then some, to allow them to push fiscal and monetary stimulus to get the economy going and pacify the population. (Also, pegging existing dollars looks much better than starting a new dollar.)