If you look at the terms of the currency, I'm pessimistic that bitcoin will become a currency. Because bitcoin does not have a real base/item that is shaped as a currency, it is different with nominal money. Besides that bitcoin has a volatile value and the price is not fixed and can change in every second, different from real money. So in my opinion bitcoin will not be a currency in the general sense but has its own understanding as a crypto currency that has a sale value.