To be frank I don't see Bitcoin becoming a Currency anytime soon.
But on another side we are seeing countries break apart due to their currency hitting rock bottom and their citizens migrating to Bitcoin.
So I have to say that in the future this may come true.
Bitcoin is gold, it's a secure store of value but not much use in day to day life. That is where Ethereum, Dash/zCash, and, crucially, EOS will come in.
Agreed, Bitcoin is rather the Gold among the CryptoCurrencies, just like @bigmantings mentions below. In my opinion we might actually see cryptos like Ripple conquer the currency market due to the low fees and the cooperation with banks. Especially international transfers could be handled easily via them.