Bitcoin is not just currency, Bitcoin is also a store of value. Bitcoin's supply is limited and the rarity increases over time.. So holding Bitcoin has the risk of changing in value.Bitcoin helps people manage their own money, away from banks and complex legal barriers. Bitcoin holders have a right to privacy with their funds. Because of the above reasons, Bitcoin is a preeminent currency.
Yes. Bitcoin is a "multi-purpose" financial tool for those who need it the most. I believe it's better than Fiat, because you can do so many things with Bitcoin limited to your own imagination. A decentralized, programmable money makes wonders to those seeking true, financial freedom. In times of need, you can rely on Bitcoin without fear of censorship from governments or other third parties. No middleman, means full control of your money. It's true financial sovereignty where people can take control of their lives for the first time in history. You won't get this with Fiat as it's subject to the manipulation of central banks and governments alike. Any transaction deemed suspicious by these entities could make you lose access to your account in an instant. With Bitcoin, there are no such limitations as you are your own bank. The only downside is that you can't use Bitcoin everywhere since merchant adoption is limited. As long as this is the case, Fiat will prove to be the winner for everyday payments.
Nonetheless, both types of currencies have their respective advantages/disadvantages. Choosing one from the other depends on your specific needs. Regardless of what happens in the future, Bitcoin will survive because of its decentralized and censorship-resistant design. Fiat won't be going anywhere soon, since it'll adapt to the latest trends in technology. With CBDCs soon to become a reality, one would envision a future where both currencies co-exist for many generations. Just my thoughts