You would have to keep making one if everyone left. Also, you would have to hope more than a couple people would stay for more than a few matches so it didn't get removed. The forums aren't too lovely so I don't know how well that would work out.
It's an idea with potential.... it's just some people might not be so kind towards the idea, especially if they get their a** handed to them and can't deal with that maturely. Still, for whoever is up for a friendly game it would be good. Could use King
of the Hill for it.