Fiat currencies definitely aren't necessary, there is an increasing trend towards digitization of currency, and blockchain based currencies are just the next generation of this. The problem is that Bitcoin came out, and everybody treated it as the successor to fiat currency, rather than an incremental improvement on digital currencies such as Paypal and Skrill. I think that if Bitcoin was never invented, but somebody like Paypal had implemented a blockchain technology first, then we wouldn't be in the rivalry scenario that we're in now.
It is the rule made by the Rothschild family. If you need to make the changes on the cryptocurrencies investment then you need to go with the government regulations for making the Bitcoin as a legal moeny to use.
If all things resolved and we made the bitcoin to be a payment option then you will be rewarded.
Centralized and decentralised medium is the problem here with these people.