That being said, if governments used cryptocurrency it opens a lot of interesting avenues for them. Tax fraud might be a thing of the past, people could be forced to register their wallets publicly, better protections for lost wallets. Inflation could be exchanged for variably adding/removing coins from the market.
Overall governments need to be able to manipulate currency, or all their citizens are totally exposed to the global market. Imagine if you had to check your savings account multiple times per day to watch it fluctuate thousands of "dollars" in value.