Bitcoin is already a currency, it does not need to become one. You can buy and sell things with bitcoin and that is what a currency is for. Although now I think people use bitcoin as more of an investment than as a currency but that does not mean that bitcoin has stopped being a currency.
Yes, friend you are right bitcoin is already a currency. Because their are some people using bitcoin as their payment in any kind of transaction buying and trading, Especially when it comes to investment,