Finally! I've been waiting for HTTPS to be the default for a while now. From a security standpoint it's annoying that bar something like HSTS it's trivial for a man in the middle to force a downgrade to non-secure HTTP. The fix is to force yourself as a user to look for the lock symbol in the address bar, but that's terrible from a usability perspective.
However, I'm not sure whether it'd be best to make this the mode the default for everyone. I imagine regular users would be quite scared/confused when encountering such a message, and that might lead to lots of valuable (mostly older) websites still running plain HTTP to be effectively cut off.