They already seemed a bit too out of place in 9.0, with how present they are everywhere, and how little is known about them. But then I got to Korthia and saw the more humanoid Devourers, who only appear around the Attendant ruins, and now I think that they could be a hook for future content, maybe connected to the Void Lords, maybe to K'aresh, maybe to something entirely new. That is, if the writers wants to, of course.