He says why he cares are the end. That it could be a viable payment system, if you solve the scaling and energy and regulation and a few other things.
I've seen a few high profile cryptographers get into the crypto space recently. I can't really blame them, it's exciting to see new cryptography put into practice. Who knows, maybe they will solve it all, but I doubt it personally.
(I don’t think drugs should be banned or controlled, for what it’s worth. I believe in pragmatic policies of harm reduction. I’m just not going to deny reality, and the harms this system causes.)
The legacy financial system - even just the electronic parts - are meanwhile the product of many decades of development, and it still ain't viable for large swaths of the working class worldwide.