If bitcoin currency can help people to make their jobs is easier, I personally assume that it is good to use bitcoin as a legal currency in many countries or wide world. If we see the system of bitcoin now, I believe it will much positive effects for human. Since each user can access to their account and do transaction by their self, no need other hands. In other side, it is also provides low price of tax or even nothing. People just need internet connection to access their personal accounts.