Bitcoin can't become a currency. Bitcoin is independent and is called cryptocurrency. Monetary is only an intermediary in Bitcoin trading.
It is clear to everyone that Bitcoin is using as a mode of exchange and for friction-less transaction besides these services and benefits we are using it as investment source of expecting huge returns. We have been experiencing its investments and profits since 9 years and this will also help you out unless and until you start with it. Now, you will have no doubt over the Bitcoin as a currency or an investment source.