He thought Moore's law would keep up with the scalability demands...
Moore's law has never applied to bandwidth (so if Satoshi really thought that then clearly he wasn't a genius was he).
Or perhaps you think that because Satoshi could never be wrong then if he said that "Moore's Law" applies to bandwidth it actually does?
Bandwidth is not a technological issues is a centralized market control by big players on Internet market. I pay 10$ per month on a fiber optic in-house connection 1gbit without any issue. Except that the fiber optic is kinda sensitive I got it broken a few times *lol*. No bandwidth issue. The same computer that is also running a Bitcoin Node I play via Steam Stream full HD games. So again what did you said about bandwidth? I downloaded the blockchain with 25mbit/sec. It was finished in exactly 3 and half hours.
My phone will be able to keep the Bitcoin blockchain right now without any issues my internet connection can do that. If miners bandwidth is an issue they they should be out of business. As they don't want power outages , they don't want bad internet connection. That's their business.