Fiat is still remain and it will not disappear that is why believing in fiat is given because it is much usable than bitcoin right now even in the future. All of us having regular job are receiving salary in fiat and spend money in terms of fiat.
Yes, I think Fiat will continue to exist even though the digital currency continues to grow. Although the future of digital currency evolving and widely used but still needed fiat. I will still continue to believe in fiat because I think it is very important and the best payment mode because we can pay quickly without the process by fiat.