At the moment, the chances of Bitcoin surpassing the value of the Fiat money is less than 1% in percentage. Even though some institutions had finally recognized Bitcoin as an speculative asset class and some hedge fund managers invested certain percentrage of their portfolio in this asset, it does not give absolute guarantee to say that Bitcoin will surpass FIAT automatically. It will surely take a very lot of time and might take some decades before it will happen. People think that just because a system had some errors, you automatically need another one as replacement. True, banks have problems too, but does not mean it had some issues, you will now say Bitcoin will need to replace them.

Foreign Exchange is one of the biggest market today which are behind it and major players are the banks. Banks plays a very important role in one country. And you cannot just immediately replaced it with Bitcoin (digital cash). FIAT was there ever since human kind understand the market so it is very hard to replace them.