And all they would have to do is import old Demonology to the DH class.
I don't know why Blizzard simply didn't give Demon Hunters the old Demonology spec from Warlocks. I mean, they changed the Warlock spec, and the old Demo spec was pretty popular. All Blizzard would have to do is simply bring back the old Warlock spec, and revamp it for Demon Hunters.
Illidan had some ranged spells in Black Temple. Blizzard could give DHs those spells, have them build up demonic fury, change into a demon like Warlocks used to do, and have enhanced abilities.
Blizzard could bring back old Demo abilities like Chaos Wave and Touch of Chaos. Not only would this add some diversity to the DH class, but also give us another much needed ranged spec.
What do you think?