> The huge problem with email encryption right now is that you can't reasonably make it mandatory
Sure you can, see pgp.
Really, its nice to see they are encrypting coms between each other but I don't really see how this affects me. If I want something secure I will use pgp. Email encryption, has and, always will be a client side problem. There is nothing the middle men and women can do for you that you can reasonably trust.
If google really wants to solve this problem they will make pgp features native to gmail. I'm guessing they're heading that way with the chrome extension being discussed here at the minute[1].