Chinese are pushing to make yuan reserve currency so I wouldn't be surprised to see this happening in the next 10-15 years. Yes there is a lot of controversy around Yuan but Chinese economy is growing every year in a vast way
And also keep in mind China holds billions worth of US treasury bonds and notes. And soon... bitcoin.
They already have most Bitcoins at their hands I guess...
I have seen an article somewhere, don't remember, but according to its stats, China holds more than 40% of total BTC in circulation, is it actually true???