You might appreciate your ISP's web proxy cache if you live in New Zealand, for example.
It would be nice if everything magically worked in this case, but I don't think we're really there yet. And I'll admit there's a downside - SSL also buys you data integrity (eg. was the blog post modified in transit?) and you don't get that here.
Still, I'm not convinced about SSL-by-default for general public information websites (with an obvious exception for sensitive health or political sites, etc).
I also don't buy the "protect your readers' privacy" angle. To me, that's "provide your readers an illusion of privacy", since they still have to trust $random_website to not leak the logs they are able to gather. Readers who want identity privacy should use Tor or similar, and not be misled by https-everywhere.