I'd love to believe this but I've never once seen the https-only nazis bring up this issue on their own, or show any concern for the fact that it will limit speech on the web. The y mostly work for companies where getting ssl certs is no big deal, and they put their personal projects on github or heroku anyways.
The backbone of the web was the fact that you could put up a website on your own computer within a matter of minutes. That is now going to be gone and I've never seen the biggest advocates of this change show any concern whatsoever.