Fixing the Park is a bigger job than it seems. Because the quests leading to the Twilight Highlands for the Alliance are there. They said they are going to do it though, so I imagine they are either going to put up a wall but keep the ruins the same behind the wall, or they are going to just move/remove the quests? Who knows.
They said they 'hope to get around to it in 6.0', but at this point I don't know if we can hold them to that. It seems like every time they hope to have something ready and tell us about it, it gets scrapped or pushed back, or nerfed in some way.