To the people who keep insisting everything needs encryption: No it doesn't. Fuck off!
You don't see me forcing PGP on on your email, do you? No? Fine, then let us non-weirdoes keep using plain HTTP where we want it, where we have determined that it is a good fit for our needs.
Besides, this is purely a theoretical concern because a browser which drops support for plain HTTP wont have any user-base as soon people discover that 95% of the internet will broken when using that browser.