It's not even the last patch yet and I feel like they could end it now and have no story ramifications. They've taken one of the most anticipated villains in Warcraft history and shoved him into a literally irrelevant patch with zero continuity.
They should have done a WoD and killed it off after 2 raids, just imply that N'zoth is watching and waiting until he gets his own xpac, I'd take that any day rather than butchering good potential even further. Putting him in as a side-arc while they are roleplaying Game of Thrones is not only an insult but a massive waste of a well anticipated villain.
I guess that's what happens when you roll a dice and land on the B-Team expansion though. Super salty they've swept my voidy boy under the rug with a casual "maybe later" and not even the slightest effect on the world.