True, even if we use Bitcoin and invest in it, I think no one will use it for daily transactions unless it becomes more stable and widely accepted by most digital payment systems. Fiat will still be around, and having many options makes the economy more flexible. Just because one asset is leading doesn't mean the others are useless, nah that’s not how it works.
People still need choices that fit different situations since we are a developing world, having a lot of options is really helpful. Not everyone wants to spend something that can double in value tomorrow. The more payment options we have, the better it is for everyday people.
I don't know why I often come across with this kind of topic and I wonder why perhaps we don't know the difference between currency and assets. Bitcoin in its earlier days whitepaper, it was for making transaction and no specific on whether it's a currency or an asset but over time, it's clear to be an asset that appreciate in value because of its intrinsic properties and such it can't be a currency to any country, it's going to be economical suicide.
Just imagine Gold becomes a currency, how does it going to looks like, when we are not in ancient days where things were done in barter system. Currencies are made to be stable, easy to exchange and no Volatility but thats why they can't be use as an asset as they don't appreciate in value that's why inflation is eaten it up each year goes by but an assets is meant to appreciate over time and that's why Bitcoin can't be suitable for currency in any country.