Has the Community Team ever sent out a follow-up email, or SE-inbox message, to all committers who haven't been seen on the beta site for a few months, giving them an update on the site's growth, and inviting them to take another look?
Following on from this unanswered question: http://meta.stackexchange.com/questions/58853/is-there-a-way-to-send-a-message-to-the-supporters-of-an-area-51-proposal
Our bright and shiny Sustainability Stack Exchange is just coming up to its first birthday since go-live. We've grown, we've just passed the thousand-user threshold, we've got some really good questions and answers, and we've just hit our second-highest every pageview count, surpassed only by a day straight after we went live, when all of our committers were emailed about the new site.
If a follow-up message has been tried before, how successful was it?
If it hasn't been done, can I volunteer Sustainability.SE to be the guinea pig?
Disclosure: I'm a pro-tem mod there.