"The existing Visa credit card network processes about 15 million Internet purchases per day worldwide. Bitcoin can already scale much larger than that with existing hardware for a fraction of the cost. It never really hits a scale ceiling. If you're interested, I can go over the ways it would cope with extreme size. By Moore's Law, we can expect hardware speed to be 10 times faster in 5 years and 100 times faster in 10. Even if Bitcoin grows at crazy adoption rates, I think computer speeds will stay ahead of the number of transactions"

Satoshi Nakamoto in e-mail to Mike Hearn

First of all - what is the consensus on authenticity of this quote, knowing Mike's history and timing of publication of that mail?

Second - assuming it's real, what did actually Satoshi mean by this? I don't think he meant any L2s, but I also doubt he was proposing centralised "data serves" running Bitcoin. Did he really assume we would run full nodes on mobile phones in 2020?