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Last answer first. Fluctuation controlled? Who would control it and for whose benefit? It might be controlled, but I say it shouldn't. Now will fluctuations slow? I think they will as the system grows. Just see an elephant move vs. a mouse! Also, at some point, if crypto becomes a dominant currency, the issue will be other currencies fluctuating vs. it and not the way around!
Could it replace the current mostly fiat based system. It certainly might. I may write a post about it.

I don't think it will, I think governments wouldn't allow this and it would change the world economy as we know it too much. I do see them being very prominent in everyday life but in the long term I think FIAT will always be more popular

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