No one likes the Blood Elves anymore other than Illidan, the Naga and the Draenei, that's why they are not a playable race. As for the Scourge, if your character contracted the disease, you wouldn't be able to play anymore because the difference between Scourge and Forsaken is that the Forsaken have free will and the Scourge are nothing more than puppets.
People should really read up on the lore more before posting suggestions...