Yeah, I think Draenei actually fit the Necromancer class even better than Goblins. A goblin necromancer just doesn't seem that fitting, since most of them usually learn classes either to profit or to survive. Eventough I can easily imagine a Goblin necromancer (just because we all know some goblins are just plain evil and want to do nasty stuffz), I think Draenei would be a more plausible addition.