Well,
1) you could look back to the folks who joined a long time ago, see if they're still active, and send a convo asking one at a time to be captain.
2) you could ask for volunteers to take over.
3) you could close the team.
4) you could just let the team go wild on its own.
I personally think #1 is good. Julian of PaperEdge has been here from the beginning, and I think he's active. It wouldn't hurt to ask. He's been here the longest.
P.S. - don't ask me. I've been here from the beginning, but I'm not very active, and my health prevents me from taking anything on.