> PGP....which is theoretically breakable thanks to the advent of quantum computing.
This is a minor quibble with your overall point, but what I've quoted is wrong. The underlying encryption algorithms for modern PGP implementations are breakable with Shor's algorithm on a quantum computer, but not all encryption algorithms are vulnerable and a PGP implementation in the future could use such an algorithm as default instead. (For instance, http://en.wikipedia.org/wiki/McEliece_cryptosystem)
This is a minor quibble with your overall point, but what I've quoted is wrong. The underlying encryption algorithms for modern PGP implementations are breakable with Shor's algorithm on a quantum computer, but not all encryption algorithms are vulnerable and a PGP implementation in the future could use such an algorithm as default instead. (For instance, http://en.wikipedia.org/wiki/McEliece_cryptosystem)