I'm gathering that Drak'thul was changed from PVP to PVE due to massive population imbalance. (Note that they gave free transfers to PVP realms for players who still preferred that type of realm.) In another thread, people mention that alliance got overrun by horde on Drak'thul and were never allowed to level, so alliance became almost non-existent.
Due to a recent article by wow.com that linked to an older article, it seems that PVP realms have been on the decline for more than a little while.
Now that we have precedent for this sort of action, I must beg the question -- when does Zuluhed get to be fixed?
It doesn't have to be soon. But my birthday is in November.
I'm not even joking about that, but I do have some practical thoughts to add.
First, people have mentioned in the discussions linked that combining realms is an indication that a game company is doing badly, which would mean that changing a realm from PVP to PVE would be the preferable choice for Blizz.
Second, if it's true that PVP servers tend to be low population and unbalanced, I can see Blizzard continuing to decrease the number of PVP realms by turning them to PVE until there are a handful of medium-to-high population PVP realms -- thus collecting PVP enthusiasts into more bustling surrounds.
Third, the previous two assumptions force me to conclude that of all the crappy unbalanced PVP realms, Zuluhed has a shot at going PVE one day. Maybe not a 100% shot, but considering how many alliance gankers moved horde to get Wintergrasp Victory every week, I'm keeping my fingers crossed.