"Edmund C. Moy noted governments are accustomed to possessing the ability to arbitrarily and instantaneously inflate their national currencies. Governments bristle at the thought of limited coin supplies or even fixed rates of inflation, so it is unlikely they will be willing to submit themselves to the limitations imposed by cryptocurrency’s algorithmic nature."
As they said, this is why it likely wouldn't happen, at least in the form of cryptocurrencies as we know them. Sometimes it sucks that governments can inflate their currencies at will, but it's occasionally a "good" thing (where by "good" I mean the better of two options that are both bad, like printing money vs. default).
