I agree. I was thinking more about "Emacs lifestyle" utilities like SX [1] as very similar to StackExchange's Android app. [2] Sure it's actually a repository, but a language community without an Emacs mode may not meet a significant segment of developers.
[1]: http://stackapps.com/questions/3950/sx-stack-exchange-for-em...
[2]: https://play.google.com/store/apps/details?id=com.stackexcha...
http://www.emacswiki.org/emacs?action=browse;id=MarmaladeRep...