Consider the group of WC3 heroes that have gotten their abilities split to other classes: Shadow Hunters, Dark Rangers, Blademasters, Mountain Kings, Lichs, etc. Just like the DH, the likelihood of any of those hero concepts becoming their own class is slim to none.
Warlocks can do the exact same thing. In fact, I would argue that Warlocks would be MORE attuned to the Legion than Demon Hunters would be, since Warlocks have seemingly mastered multiple aspects of demonic magic.Then that is your opinion that it's just because it's cool. I can say easily that a Legion-based expansion, and the familiarity of the Demon Hunter class would be strong components towards a Demon Hunter class as well. It's a class everyone recognizes and understands the basics of, even if they don't know the details.
Or accept that the Demon Hunter story began and ended with Illidan and his Illidari, and place all traces of that lore into the Warlock class.And like Yig says, the Demon Hunter class is plagued with conflicting and ominous backstory that needs to be ironed out. The best way to approach that is by having it fully featured, potentially as a playable class/spec. Gameplay all comes naturally in the end, given Blizzard is able to expand the Class Identity into new territory, just as they did with allowing Priests to use Shadow Magic or Paladins to use Shields.
Which is exactly what Blizzard has been doing. I'd say its working so far. Warlocks get an interesting source for abilities, and we don't have to worry about the ludicrous amount of class overlap from a DH class, and we don't have to worry about yet another DW melee class being implemented.
Would you prefer this;The Pandaren is a part of Warcraft since Warcraft 3. That particular concept piece doesn't fit Warcraft at all.