It's still possible to avoid leaking information to GA, by rewriting outgoing links to go through a redirector. Many sites do this (including Google Encrypted Search, but its not perfect).
The email problem sucks though. We need end-to-end encryption, on all mail, today.
You are right about the outgoing links on your site to avoid leakage (this is what well implemented search engines like DuckDuckGo does as well), but I think GP talked about the incoming links of your site. Your pages will appear as exit pages in Google Analytics which you cannot do a thing about.
The email problem sucks though. We need end-to-end encryption, on all mail, today.