But we got to admin, more and more people are not very trusting to their government and banking system these days due to what had happen in the past like in Greece or worse was what had happened in Zimbabwe. Venezuela and some developing countries where there political meltdown is about to spread, the citizens in these countries are likely to be interested in BTC to store their wealth which is why they foresee bitcoin as the future. Fiat isn't going away though.
The reason behind the fact that people will still need real money is that they can use their instruments of fiscal and monetary policies to control inflation and unemployment. The policies built around the fiat system and made that way and can solve the problems by increasing or decreasing the supply of money in printed form into the economy. Crypto alone is alone and will not be able to assist the users in that way.