As of 5.2, we notice that the Sunreavers/Blood Elves get their hands on the Dark Animus apparatus and are capable of studying blood/life magic as Lor'themar implies. Like we've seen with Warlocks, schools of magic tend to be adapted by player classes and the Sunreavers, as a group of arcanists, get their hands on a new one.
According to that info, in which class do you think this type of magic will end up to? Mages or Warlocks? Or would you propose an alternative?