Billions of Dollars wouldn't effect a nations currency, as you'd think. Especially, it being CNY and also take into account that if China knew that loaning that amount would put them at risk economically they would have not made the agreement on the loan.
It may not affect a nations currency, but it's an huge impact on the bitcoin marketcap which is only a tiny amount at the moment, not even 2 figure billion marketcap yet, we are yet to see x1000 growth minimum, I wish a couple of countries pulled a China/Cyprus and everyone started getting their money out of their respective countries thanks to Bitcoin.
Any group of people that begin to start selling their traditional currency for Bitcoin is pretty big, not only does it show that the people have faith in the currency, but it also shows that there are people willing to use it to store their wealth, regardless off the volatility.
I am sure that if the stock market continues to swing down as it has, we'll see some more people in countries start pulling a cyprus, a lot of people have been worrying about a repeat of 2008/2009 for a while.