Do you understand what it means exactly for China to unpeg its currency to ours? It brings with it a whole list of dilemmas the Chinese government has been (somewhat) successfully able to ignore since Deng Xiaoping advanced economic reforms, and the very last thing that a politically and socially unstable China would like is a United States totally crippled by the resale of its bonds (to other people by the way, they're unable to, like, make us pay before the bond reaches maturity. That's the point of a bond).
In fact, the wholly concept is patently absurd. If what you say is true, and the United States is so clearly on the verge of collapse, then China would have to sell these bonds to others at a huge discount, in effect eliminating a huge portion of the debt, not increasing it. But, let's not devolve this into 'what ifs?' that are unlikely.
I'm going to give you the benefit of the doubt and assume you meant 'if the yuan is unpegged from the dollar during this hyperinflation'. By the way, it wouldn't be hyperinflation because the answer to the problem would not be print more money, but ok. Like I said before, allowing flexibility in the value of the yuan relative to a basket of currencies, combined with an increasing realization that employment practices in China are unsustainable puts China in a precarious position itself, and most experts (let's say, James Fallows for starters, but I'll name drop for fun and put Hiroki Takeuchi and Minxin Pei) agree that a weakened U.S. would just be a one-two punch situation.
tl; dr again? Conspiracy theories are called such because they involve things that do not coexist peaceably with reality when dealing with rational actors on an international stage. Also, you should really read more (as should we all!).
P.S. Incidentally, worker's rights and the current wave of protests is primarily an issue of second generation factory employees, who will not put up with the standards of treatment afforded to migratory workers on a general basis, and is actually a fascinating area of study in its parallels to American immigrant trends.
XI Wiki


