I guess there aren't enough questions per day to graduate -- see http://area51.stackexchange.com/proposals/45110/buddhism -- there are currently 4 per day, and SE might prefer 10.
Perhaps there's no hurry though -- the last I read (many months ago) SE no longer has a "graduate or die" policy for beta sites, i.e. a site that doesn't graduate can stay in beta for as long as it remains useful.