I'm pretty unsure if he isn't just using bitcoin as synonym for a currency based on cryptography. That said, i don't think bitcoin can or will replace fiat in 10 years. Like you stated out, most people don't know about the blockchain-Technic behind the coins. A lot of folks are just going for a fast dollar gain, they don't even care about the idea behind "bitcoin". There is still a lot of work to do, the whole thing needs to be more convenient, pleasant and more forgiving. If we can solve this issues, acceptance or adaptation will grow in a steady way