The author takes a large enough block for Visa or Master card volume like transaction and makes an educated guess. His argument is _true_ in the same way sayin

The author takes a large enough block for Visa or Master card volume like transaction and makes an educated guess. His argument is _true_ in the same way saying that you could only fit a calculator in a hangar using vacuum tubes is true. If Cryptocurrencies are to succeed they need their silicon transistor. To me the transistor of crypto is sharding. I'd bet Vitalik knows that and that is why he is putting R&D into it. I do hope Ethereum (or another one) succeed.