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I made such a comparison because of closeness of number orders (10^2 billions). Of course, world currency market is much higher in orders, so should we expect 5x growth in the next couple years ?

It's hard to tell, but I wouldn't be surprised at all. We will probably see the bitcoin dominance shrink even more and more coins reach a bill or two cap.
5x in a year seems unlikely since we have a pretty high cap already, but we should see it eventually.

By the way, I've seen an estimate of 2 trillion in next 5 years for cap recently on Youtube.

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