Still a Wintergrasp clone. As stated, also before Holinka. If people got what they wanted we would have another Tol Barad. Part of Wintergrasp's appeal comes from the fact that it was new and exciting (mainly because it was new), people hadn't had something like that. We got it again in Cata and it was hated. At that point people were over it.
Wintergrasp in all actuality is not as great as people remember it. You try to cap 3 towers to extend time and hold ownership of workshops to besiege a tower. It's the same formula as Isle of Conquest, and look how well received that was. The only difference is that Wintergrasp felt mandatory (same as Tol Barad) to get a chance at extra loot. You take away the raid portion and people don't really like instances PVP in that setting as much as they let on.