Bitcoin is already a currency but it is not yet really used like the fiat currencies. The reason is that it is not yet supported everywhere as a payment method either online or offline. That is why people still considering Bitcoin mainly as an asset, they trade and hold it for making good profits.
maybe it is true what you say and maybe in your country it can be said that the crypto currency is able to fulfill the function of the real currency but in my country the government still prohibits transactions directly using crypto currency