Bitcoin will never take over fiat currency, at least not in our lifetime.
Hundreds of years of regulation, practices, and geographical locations have come to give fiat currencies value. Bitcoin is tiny in terms of volume, market cap and use cases.
Most of the worlds population hasn't even considered buying a bitcoin.
Sure I get you made some money on it but be real, it's not what you're buying your groceries with each night.
Indeed, even for us that bitcoin seems a popular currency and it is a great investment to put our money but for most of the people in the world, it is not an interested topic for them to buy bitcoin and consider it as a legit investment because for them, bitcoin is not worth it because of its fluctuations which is wrong and even bitcoin cannot replace the fiat money, it can still be adopt by a lot of people and the majority of the people in the world just need some orientation so they can learn and understand bitcoin.