His current kit is really great, although he needs some balance on her health, damage and his Evasion. I would like to see a rework for Illidan but by no means I do like the valuable kit (current kit) to be removed. I do not think current concept is very suitable for him and I know better concepts in the World of Warcraft, also Warcraft III Illidan will be a great by some change.
I think it would be better to give this concept to a Female Demon Hunter and consider a rework for Illidan.