So... that's an interesting question. After we get finished beating down necromancers for their necromantic lore (and to stop Nagash from doing the Nagash things) where do we want to go from there? What new pool of resources would we want to add to the Skaven? Who are the particular threats that we might want to beat down before they grow? For example, lookign at the Wood Elves and the Bretonnians... I don't see that either group really has enoguh to offer that it would really be worth going after them. The Bretonnians have cavalry and a whole lot of religiously-based magic and not a lot else (ie, nothing useful we can steal). The Wood Elves... have the Oak of Ages, I suppose. If we can warp and exploit that, that could be useful, but I sort of feel like if we aren't intending to warp and exploit that, there's a lot there that isn't worth having.