I believe in Fiat because it will always be protected by the government. Fiat is a way of controlling people, so it will never disappear
Then what if the government starts to shift? what if government uses bitcoin to control people?
To be honest, I am still using fiat as there is no other way in where I live to survive using bitcoin alone. If there is a way to eat and pay my taxes with bitcoin, I could try living 50/50 between bitcoin and fiat.
Without fiat, my everyday walk of life will be paralyzed.