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.
I agree. The only thing is is missing is that the legitimacy of bitcoin. The government acceptance is what it needs in order for it to be used all over the world. It really matters but then bitcoin can work even without the government approval and it is very functional, effective and efficient.