I don't think the Hive will ever turn away from the Darkness. From birth each is infected by a worm. It commands their entire existence from a subconscious level. Yeah, Oryx has always been a bit on the fence about the Worms and their quest. Oryx probably came to our system to wipe out the Traveler and the Light, as is his Worm's command. However, he could have also been out for revenge