A good question. You are now approaching the idea of a post monetary world. How close is that? It is likely longer than most people are estimating.
We nee 100% free or minimal cost energy. At the same time, we are going to have molecular assemblers to build things from the atomic level.
Is that possible? In theory physicists say yes but the engineering challenge is enormous. It might be decades before we can even think in that realm.
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I think blockchain itself is a good technology for the future, and I'm not sure what kind of role cryptocurrency would have if it's even necessary.