I don't think this should be done cavalierly, because it's a huge strain on gamerunners, especially gamerunners who are looking to do anything different. It's easy to say that adding teams won't change things up when it hasn't before, but the difficulty curve of running games with more teams is nonlinear -- this has been true in the past as well.

However, AJ and Zazzle have noted that they are going to do a non-anon community brainstorm about this at some point soon. It would probably be a better idea to restart this discussion there.