It might work against hyper inflation. But other than, that its kind of worthless. And when you have hyper inflation, governments usually crack down on any kind of currency movement out of the weak currency to try and prop up the local currency.
So this is great, if you think that your currency is going hyper inflationary in a short period of time. I don't think there are many cases in which that would be useful.
Otherwise, if Bitcoin can be called a currency, then its also suceptible to variance in value as we've seen over its lifetime. Teh Mahts don't protect against it losing value.