Scott Chamberlain and I were discussing this on Twitter and Scott suggested setting up a Discourse site which we'd have full control over. There are more details in a gist Scott wrote which you can comment on.
Apart from being our own masters, a discussion forum might be better suited to the types of questions we'd like to ask or discuss, many of which don't fit neatly into the Stack Exchange way of thinking.
Anyway, if you have comments on this Discourse proposal, hop over to the gist and leave a comment.
Proposal: Open Science