Meh. Guess it'll take another 7 years until crypto & libre take off.
Throw in Monero to pay for services and you've got a great technological stack possible right now, while something like that at the time of the cryptonomicon was just a dream.
It could be a cool project if it took advantages of all the pieces of technology we now have that they didn't have back then - PGP was a late addition, replicable builds not a concern, tor and cryptocurrencies yet to be invented.
Speaking of Monero & paying for services:
GNUnet has the GNU Taler project. While not applicable to the same use cases to which Monero applies, it fits into a related niche very much in need of filling.