Earlier quoted context omitted.
Google Chrome is supposed to soon start flashing a "not secure" warning on HTTP sites that have password forms [0]. That's probably at least one motivation for these publisher moves to HTTPS [0] https://security.googleblog.com/2016/09/moving-towards-more-...
What happens with local LAN machines, like the admin webpage for your wireless access point? It's not like they can go HTTPS?
They're not trying to force everything over to https, they're just trying to make warnings more sane. And if a page is not secure, marking it as such makes sense.
https://security.googleblog.com/2016/09/moving-towards-more-...