More than any other NPC, WoW is a story about Anduin. I like that he is a rather over-idealized character. It actually puts him at odds with the rest of the Alliance leaders, outside of maybe Mekkatorque; whose justice, virtue and honor is seen time and time again in his countless narrative rich story elements. The next expansion after BfA will probably be a revisit to the Scourge storyline and Naxx timewalking. It'll be interesting to see what parallels between Anduin and Arthas they decide to write; or if they bring back Arthas for the Arthas vs. Anduin showdown. And I can't imagine Sylvanas going anywhere before she has at least one more reckoning with the Scourge either. And what better time for the Scourge to return when the battlefield is thick with the corpses of Alliance and Horde soldiers?