Call me crazy, but this stampeding thing looks like something that might deserve a discussion thread all on its own.
That said, maybe it's time to reconsider what qualifies as a major faction. Obviously, sheer numbers don't matter as much when considering the quality of the story being told, but quantity has a quality all on its own. If you took the six best writers on the site and put them up against a faction with ten times that number of active writers, it might just be possible for them to eke out a win, but they're iceskating uphill at that point. They're going to come out the other side exhausted and stretched thinner than gold leaf, and their chances of surviving the next invasion go down dramatically.
And, if we're honest, by the time a major faction gets down to having so few active writers that they're in danger of recall, they can hardly be considered a competitive force anyway. Stubbornness and pride will prevent most from throwing in the towel, but it's not fair for a faction that has a large active writer base to throttle their activity to accommodate a faction with one foot in the grave and the other on a banana peel.