[lawn]

Which is why a dynamic block size should be implemented. (This is on the roadmap for Bitcoin Cash).

For reference here's a paper by Peter R, a prominent Bitcoin Unlimited developer, arguing that a blocksize limit is unnecessary: https://www.bitcoinunlimited.info/resources/feemarket.pdf

Who's right I do not know. But even if Greg is right he's worrying about a potential problem decades from now. We have very real problems right now we should solve first.

I would also be wary of any claims Greg makes as he has clear conflict of interests against raising the blocksize. He's one of the founders of Blockstream whose goal is to earn money developing 2nd layer solutions. With working on-chain transactions what use would their 2nd layer solutions have?