Did you know...Bitcoins current transactions per second capacity is roughly 7 and Ethereums is 20. Visa can do 24000. But do not be disheartened. Visa has a 60year head start. With state channels and other updates billion transaction per second systems are muted to be possible so watch out Visa
You failed to including Lightning Network in your calculations. You also failed to include SegWit in your calculations.
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