While a currency needs to have stability to become feasible, an asset doesn't need to obey the same principle. A means of exchange needs to be stable, durable, divisible, and difficult to be counterfeit, on the other hand, an economic asset doesn't need to abide by these same principles. Volatility in Bitcoin may be a problem for someone to use it as a currency, but it can also be a good thing for someone to speculate. That said, depending on what you want to do with your bitcoin, volatility and speculation can be a good thing.