For one I'd like to side with old aggie. I think it would be too obvious for the Parshendi to be the "antagonists". Moreover, they somehow seem too intelligent to be "THE Voidbringers" to me, I've always imagined them as savage. Although I must say that I believe that the Voidbringers are not the worst part to the story, it's... this is only the first book, you should know better than to conceive the whole story's already said.