I disagree pretty strongly with making this discussion board private. Not only will this seriously limit new members who might be interested in joining, it won’t prevent leaks for hitting the news.
If the Ethereum research git had been private I probably wouldn’t have joined (since I wouldn’t think I was qualified). It was only after spending some time lurking to get the feel of the place did I think I might have a little to contribute.
As for preventing news articles. It would be easy for someone to lie their way though the verified login to leak information if they wanted. The only way to stop this is to make it so the community can’t grow by very strongly limiting people who might want to join. This feels like a very bad idea for a free open source project. And the news writers will find other things to FUD about (Twitter comments, whatever), at least that coindesk article points to real papers that might lead a new dev interested in Ethereum to places where they can be of use instead of social media.
Ultimately, anyone who’s intellectually honest can see that reasoned disagreement (even if vigorous) or errors in a work-in-progress document are normal and healthy. Anyone who isn’t honest and is just out for blood doesn’t need anything real to make noise about.