Void elves are always canonically on the brink of becoming slaves to the old gods and voids. That’s not exageration, Umbric tells you that himself.
The Forsaken have immense resistance to the void’s mind control powers, and the void is weak to death.
Of course, Nu-Blizzard loves the Alliance and hates the Horde, so you know how this is going to go. Voids elves weaknesses will be forgotten. Forsaken’s strengths – just like their religion – will be given to void elves.
Then forsaken will fall apart and die when they clap for void elves winning.