Already is going to be used by all over the world. Now itself bitcoin is used by many people across the world and in future there will at least 80% of the population who will prefer bitcoin over traditional currency because it had much more advantage they traditional currency.
Yes, bitcoin was already part of future money, the acceptance of bitcoins worlwide was really happening. In some country, bitcoins are already accepted in some merchants, this only proves that many people are now recognizing bitcoins as a money, as an alternative way of payment aside from the traditional paper money or currency. Bitcoins will definitely a future money.
It might just happen, but it's all too dependent on growth and condition in the future. for all the things that we think will be a very good future in fact be something that is not good for the world. so this all might just happen, but we cannot determine if this is actually the case or not. Better think how to find bitcoin as possible than should be giddy thinking of the future