For those who value security enough to take the pains to learn the system, yes, it's useful. For your average netizen, we feel a progressive approach would be more effective. Start out with a key escrow service and if the user wants more security, they can ratchet up to PGP.

It's one of only 2 or 3 techs mentioned in Snowden leaks as capable of blocking NSA. GPG specifically. That's enough reason to build on and around it until we have a usable solution just as strong.