Highly doubt it. As much money as WoW still makes they have found that they can make a ton of money from smaller games with less upkeep. I feel like when/if WoW ever finally dies in the somewhat forseeable future they will just focus on smaller games like Hearthstone, Overwatch and Heroes of the Storm. Will also probably see them keep Warcraft alive (outside of Hearthstone) as a new RTS or maybe an RPG or something.