If there was no Dunyain, then there isn't a war at all. The Scarlet Spires grandmaster isn't assassinated. Which is what starts the while thing. The war was a goad set up by a Dunyain (Moenghus). So, if there was no Dunyain there wouldn't be much of a story. Maybe resumption doesn't occur because they can't find the right brain for the carapace, because Kelmommas never would have existed. If there was no Dunyain, isn't a very intriguing question, imho.