Also the notion that only journalists/whistleblowers by today's definition need this level of security is wrong. Your "normal", politically active person of today may be the whistleblower of tomorrow. E.g. after a regime change, or just by voting some crazy people into government. I'm living in a country where bloggers are sometimes arrested because of some alleged nonsense. But even in the West, it's nowadays all too easy to just be labelled "terrorist".
So the only sensical way forward is to popularize secure communication methods so that they are normally used by everyday people (including "professionals") with their everyday systems. This increased user base would likely increase the demand to close the existing holes and insecurities of the rest of the system, thereby creating a market force in this direction. And for this purpose, I agree with the author that PGP is not the way forward.