"One blockchain to rule them all" would be the greatest error for cryptocurrency and blockchain. It would defeat the purpose of decentralized money. On top of that, it's genuinely dystopian.
However, blockchain makes sense for the uses you described earlier plus more we haven't even imagined.
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I agree! I think many different blockchains with proper interoperability among them is the way to go
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It would be like trade and commerce in pre-Industrial Revolition times. Different countries had their own gold coins, but all were accepted everwhere because what mattered was their weight/mass and purity. It could be similar with crypto over time.
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