Imagine that economy that we know it today is not needed anymore, personal profit stimuli is just a page of a history and social and political life is just different from it's today version.
How then needs of people are solved, and on what would you spend your time and energy in that case? Did you see the crypto there, and if yes in what role?)
Today's economy system cannot be eradicated completely. We are going to have a perfect economic state where your money will not lose its value and also no one can freeze our your money. A mixture of crypto and fiat based economy system will be serving better than what we have with fiat only system. Our needs will get solved in a similar manner how we are doing right now. Because crypto will act exact similar to fiats hence we do not need to worry on crypto based economy system.