It is true that, nowadays, you can earn money by trading some bitcoin. However, by its nature, bitcoin is not something like that at all. Satoshi Nakamoto, its creator, has invented the system of block-chain as a way to make it possible a peer-to-peer payment system on the Internet without third-party organizations. Thus, for bitcoin to be a pioneer of a brand-new social model or to be something revolutionary, we should SEPARATELY consider bitcoin (and other virtual "currency") and currencies issued by nations.
It was made to be the currency, but for it to be used as a currency it has to have value. Value is determent by supply and demand and thus it has nothing to do with what bitcoin was designed to be. Until we reach huge adoption where many people use it as a way to trade and transfer value between each other, for this it's price has to be higher than it is today you will see that price is not near to stable. You can't change that.