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It's simple really. A big block containing Visa level numbers of transactions would be several gigabytes in size and impossible to transmit over internet in under 10 minutes. The internet also scaled through a second layer solution that's running on your router right now (Network Address Translation NAT) so that's why I believe they are the most likely solution. Big blocks just kick the can.

What you talking about bcashers are getting tb blocks soon. Full nodes ain't important. It up the mining pools to do it. No problem. That is totally decentralization am i right :)