Personally, I don't buy the whole "Castle as their landmark" discussion. It's way too similar to Magic Kingdom, and Universal isn't Magic Kingdom. And, while I think SNW will be the main area of the park, I don't think it'll be the centerpiece. It'll be something else, something completely new to the Universal parks. LOTR, Pokemon, Classic Monsters, and/or a brand new themed land fit that bill.
Keep in mind, Universal's target demographic is still teenagers. And, even though they'll build a more family-friendly park, they're not going to forget about what got them here.