Unless you're a country bound to a currency controlled by another nation.

Say the Euro collapses. There are many countries who may suddenly decide it makes sense to switch to a new currency. Some may consider BitCoin. In the historical case of Europe, this is unlikely, but it could happen elsewhere.

BitCoin might be a harbor in the face of runaway inflation. Even the swings of BitCoin pale in comparison to periods of massive inflation in several countries.