Governments also won't care about losing money when taking strategic action to protect their seignorage and inflation tax racket.
Maybe the boom/bust wouldn't matter too much. It depends on how people see bitcoin. Are they trying to save in it? Anyone trying to save in bitcoin is delusional given its infancy and volatility. A better description would be some people are trying to speculate in it. For similar reasons, people won't use it as a unit of account.
If people use it as a medium of exchange then volatility won't be of as much concern. If you need to make a trade in BTC then obtain the BTC and trade your item quickly. Given there would be spreads to pay on each trade in and out of BTC then it doesn't seem that likely a strategy unless people wrongly think of BTC as anonymous and are 'hehe, the man have no idea i'm ordering this off silkroad'.
What is interesting is that BTC is not a sovereign currency. So say BTC takes off in Russia and Putin decides to smash it: Does he need to think of the American's reaction if he does? Any country in the world - or any entity big enough (a corporation, a multi billionaire) could decide to cause mischief without it being considered an act of war - which say if China decided to sell 1 trillion of US treasuries might be construed as.