The fact that they don't lends weight to the spdy conspiracy theory (can it be called that that?)
I honestly think http/https should beside the point. Websites should transparently redirect to https if they need to (so the padlock appears), but there is no need to signal this to the user with some cryptic techno-gabble.
The web largely of sites that could do things better, but don't. We have to work around that, because you and everyone else here knows in the deepest pits of our little black hearts that these sites won't be fixed.
From a UX point of view, definitely. But from a security point of view, this isn't good.