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-...
Using https for a local network connection will also be more common, in the case you decide you don't trust the network.