I can believe in fiat at this time but in the future I can not because we are using smart devices in the digital world and we can use payment tools online such as bitcoin, altcoins for it. I feel easier ans faster than fiat. it does not need much private information or verification on payment and It's easy to transfer money to another one .
yes you are right, the whole world is moving towards digital technology. But Fiat is a moral people need. for many people it is very important to have in your pocket paper money