Great, more Xllidanx wannabes. Not like Cursed Vision isn't overused as it is.
Unless Blizzard want to take abilities away from other classes to rebuild Demon Hunters as a unique niche, Demon Hunters won't be implemented. And good, because anyone but Night Elf/Blood Elf demon hunters would look incredibly stupid. Almost as stupid as Tauren Paladins or Gnome Priests.