It has already been a very good source of income for a lot of people all around the world. Many governments all around the globe don't like bitcoin, as they don't get taxes with transaction on bitcoin.
The important role of bitcoin is to increase efficiency in financial transactions, because the system used is blockchain to reduce the problems that have occurred. Then eliminate opportunities for corruption because the way it works is decentralized, data is spread across multiple servers. Bitcoin also triggers the growth of internet users, because without internet bitcoin transactions will not be able to.