That's because most people only see Bitcoin as an investment rather than a currency for day-to-day purchases. But I believe that will change in the future, as governments embrace Bitcoin in every way. El Salvador was the first country to adopt Bitcoin as legal tender, with many more to follow suit (hopefully) as the pioneer cryptocurrency becomes more popular worldwide. I wouldn't say Bitcoin is expensive and slow since we already have a scaling solution dubbed "The Lightning Network". For mainstream payments, the LN works like a charm. With instant transactions and dirt-cheap fees, Bitcoin can reach the masses like never before.
What's really stopping "hyperbitcoinization" from become a reality is the Fiat standard. Since most of the things are valued in Fiat, Bitcoin's price fluctuates like crazy on the market. Only a collapse in the current monetary system powered by central banks and governments alike will push us forward towards the complete decentralization of the global economy. The chances of this happening are very slim, but anything's possible. Who knows what the future of Bitcoin will look like? Just my thoughts
Even though bitcoin has become legal tender there, most people still don't adopt it for real. They have just claimed the 30$ btc giveaway and most probably converted it to dollar currency in order to use the money, abandoning bitcoin from that moment on.
As we can see, friendly crypto governments aren't enough to push adoption upside in large scale. The situation is more complex than that, at same time it summarizes in lack of interest from common citizens for bitcoin.
Taking this into consideration, I don't see bitcoin replacing fiat in daily life for the next few decades. Only future generations can develop a new mindset which will allow them to see bitcoin's potential on their routine as main exchanging tool for goods and services.