You can't not believe in fiat, it is the basis of today's society!
Whether you feel that the system is flawed and bound to fail is another question.
If that were the question I would say that I think the governments of the world are doing a good job of propping up currencies that are being printed to death. I don't know if Crypto is the answer either, but maybe it is an answer along with commodity based/backed currencies.
That is correct. Fiat is traditional currency in the world at the present . We can not leave fiat for digital currency such as bitcoin or altcoins. People are using fiat everyday. If we want digital currency to be used as fiat, we must wait for long time to promote all people much more about digital currency. Once people know about digital currency , I believe that fiat will be gradually replace with digital currency