... the most manipulated currency in modern times, one that has zero ties to anything except the US dollar save for random political repricings, the weakening agent of a failing communist regime, the propaganda tool of the modern monetary age, and that's your base?
Everything you just listed was 100% inconsequential to it's survival. Completely non-related.
There really are two things that matter to a fiat currency's survival in this world:
1. How big the military is backing it.
2. How much Debt that country is in.
#1 usually trumps all, excepting only when #2 REALLY gets bad.
The debt is really getting bad, bros. For all 3 big currencies in fact, the USD, the Euro, and the Yen, they are all in epically shitty shape! All 3 Printing at record levels while their economies wither. All 3 Printing just to pay off the interest on their debt, never the debt itself. All three doing advanced Keynesian borrowing tactics that tempt fate daily. ALL THREE OWNING A LARGE CHUNK OF EACH OTHERS' DEBT, TOO. Shit's going to be bad bros. Really, really bad.
The Yuan will simply be the biggest currency left when these 3 fall. That's the reason it's smart to base Bitcoin's price in it; IT'LL STILL EXIST to keep comparing it to bitcoin for much longer.
And the Renminbi is valued by a managed floating exchange rate with a base rate determined by a basket consisting mostly of the currencies LukeP mentioned, "certainly will be [collapsing]." Unless the PBOC exponentially increased the trading band almost instantaneously, the Yuan would directly follow those currencies into oblivion.
Do you honestly think that the PBOC will keep the Yuan linked to that basket once hyperinflation starts up in earnest between them? Bullshit. They'll simply declare that they've uncoupled it, and the Yuan is now worth a Yuan, which is the world's strongest currency because they have the world's strongest economy at that point.