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Certainly, after a successful upgrade, ethereum will soon grow in all directions. There is not even a doubt about this. I don’t even quite understand why some people doubt the prospects of this coin.
I think that this is debatable. But it seems that comparing to the tech of other coins (future prospects) is considered advertising.
Either way there are projects that are more energy efficient than Ethereum, and can process 10 000 transactions per second at this point at a much lower cost.