No it doesn’t. There are many examples where those holding fiat were out of luck at failed currency end-of-life, and transition to a new currency. I’d prefer to not have dollars NOR rubles.
Metals though a different story...
“I’d prefer to not have dollars NOR rubles.”
But in your own words, you said that “BRICS is ramping up.”
If BRICS is ramping up, why not have all your assets in a BRICS currency and have it all in a Moscow or Cape Town based bank?
All those metals are a drag to lug around and tend to be hard to explain at border crossings.