You can go to crypto fully as an assets and not as a currency because many people don't adopt crypto and it will be difficult to buy things with bitcoin in different countries as different merchants do not accept bitcoin for transactions.
Before we all go fully into crypto, I hope you have device a method to help us to deal with crypto volatility so that people will have confidence with their wealth.
You are not wrong at all, in reality, people use fiat, they depend on it everyday for spending, fiat is inevitable and citizens of a nation a particular fiat is spent have no option than to depend on it for now.
Bitcoin was created to be a P2P means of transferring money in a way people can have freedom over their own money, but also to be an investment means, that is why it has limited supply of just 21 million coins, because with demand, the price will continue to increase. People have preferred to go more for the second option which is investment.