Perhaps something like content based addressing, or using something like certificate transparency to protect site contents.

The problem with https everywhere is - for all its good aspects - it adds a layer of fragility to the web. It seems like we're leaving the day where a website can simply be, untouched, for decades. Now if you don't update your TLS certificates every few months, the thing goes poof.

It would be nice if there was a good way to publish content to the web without having to tend it constantly.