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.
In my opinion, bitcoin was created according to the criteria of a method of online payment safe, effective. But there are surprises happening. It is characterized by decentralized supply being exploited in the pursuit of profit. That has changed bitcoin into an investment choice by the spreading effect of popularity. Bitcoin outperforms paper money and "virtual money" like webmoney, payza, paypal ... but it will not be comparable to paper money of each country in terms of operation and maintain value.