"HTTPS only" is Google's end goal though. There is already the rule that all new web features are only enabled for https. As they write in the OP, it's possible

"HTTPS only" is Google's end goal though. There is already the rule that all new web features are only enabled for https. As they write in the OP, it's possible that plaintext http will even lose features in the future that are still supported currently, like long-lived cookies.