Fordim is right, and I agree that we shouldn't let the game get too big. If it gets too big, players and characters tend to get lost or feel like they are no longer needed to pull the story along.
Besides, we can have a few main characters in each group, especially in the bad guy's section, and then their minions could be carry-along characters that pop in here and there.
Yup...that's what I've got...
-Aylwen