A serious plan isn't needed to unseat the current #1 tribe, they're only mass recruiters. However, it's gotten to the point where they are able to replace their deadweight through mass recruitment. They have over 150 players in all of their branches combined, I doubt all of them realize the fact that only 60 of them at most will win the world IF they were to stay rank one.
Because of this, their family will fall apart, as the higher the size, the worst their coordination and organization gets. Although numbers will help, I doubt they'll survive August. But to answer your question, if there were people planning to take them out, I'd say the WFF has the best chance.