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?)
P.S. I know the Ideas of Karl Marks about post-komunism and not a fan of it)
Not going to happen, it is that simple people have all kind of ideas of what we will do then but that is not going to happen, you are talking about a post scarcity kind of world where your everyday needs are solved but that is not true, even if all your desire for material possessions were solved you will still want things that are scarce, like knowledge, love or a desire for recognition.