This leads me to a prediction

 If you screw with the Forsaken too much then they are surely going to revolt. I bet one of the plot lines may be them against Garrosh leadership. With all this talk of phasing it would not be hard for them to phase out Orgrimmar between Garrosh leadership and that of someone else (heck raids could be against the same boss who appears differently to different people). It would make sense, really. I do not really see Sylvanas as the type to bend knee that will make you more Runescape gp.
Well, they are still going to be a playable race so we must expect some kind of respect (and not outright Forsaken internment camps like the one in Alterac) given to them and their starting zone. Yet, at the same time, we have to assume that they and the Blood Elves are not going to be getting any preferential treatment. They also probably will not be seeing undead only cities again without Orcs breathing down their back.