Not agreeing or disagreeing for the most part, but in 2009 all of the prerequisite technology for cryptocurrency existed: general purpose computers for the average person, accessible internet, cryptographic algorithms and methods, and cheap storage.

For 256 bit computers, we need entirely new CPU architectures and updated ISAs for not just x86/AMD64, but for other archs increasing in popularity such as ARM and even RISC-V. Even then compilers, build tools, and dependant devices with their drivers need updates too. On top of all of this technical work, you have the political work of getting people to agree on new standards and methods.