I think the failure of the WCA process thus far has shown an enormous lack of connection between chapter bureaucracy and what editors actually care about.
Wikimedians have a rightful distaste for off-wiki bureaucracy. The distinct lack of formal bureaucracy and organisation (we, of course, create our own bureaucracy - see http://enwp.org/WP:WTF ) is one of the chief things about Wikimedia projects that a lot of us like. I've sat on far too many committees in my life. I have kept a small eye on the WCA discussions and have yet to see compelling reasons to think that it would do anything to actually directly help the projects. I'm sure if I pulled 10 random admins from English Wikipedia and asked them what the WCA is, they wouldn't be able to tell me, or they'd give me a cynical answer like "it's an empire-building project for political players in chapters".
Whether that's right or wrong, the WCA hasn't made a case to the people who actually matter: the people who hit 'edit' every day on the projects.
The same will be true for other thematic organizations and so on. These organisations will exist in political limbo - supported by chapter bureaucrats and the Foundation - until their importance and worth is actually sold to editors.
Sell us, the editors, on why these things are necessary, and the process of getting approval from the WMF Board will be easy because the political winds will shift in your favour. What exactly are Chapters trying to do now that they are failing at that necessitates the creation of the WCA?