The problem with email is that we've arrived at a monoculture. TLS-enabled email is pretty secure if nobody can compromise either of the two ends (or, well, the intermediaries). Since everyone uses Gmail, it's trivial to just get everyone's email, since one of the two ends is pretty much guaranteed to be there.

If we move to a system where everyone has their own mail server, or at least one mail server for a few people, that system will be much harder to snoop on.