In thinking about it, I'd have to agree that all of the wolves would not survive, although I believe Jacob would get away with Nessie. Jacob is that dedicated to Nessie, and he would do whatever it takes to get her to safety. I just believe they would get away.
I know that if SM followed the "rules" of literature, it would be wrong for Bella and Edward died (as someone else previosuly suggested) but I think that's why she avoided the fight actually happening at all because I don't see them making it out of there alive. Bella would have been the main target of all the guard so they could get to the others, and I don't see Edward surviving without her. Honestly, I think Alice and Jasper have the best chance, simply because of Jasper's background and Alice's abilities. Esme and Rose would be taken down quickly, I think...if Bella was taken down, and then I think Emmett would fight like crazy, take out a lot of the Volturi, but eventually he'd be taken down simply because he would be outnumbered. Carlisle would fight intelligently, but I think again, numbers would be against him and he'd fall in the end.
I think a vast majority of the Volturi would be taken out, certainly all of the main characters. Although, perhaps Aro would survive cause I see him as the type to flee the scene as soon as things didn't go his way.
Anyway, just my ideas on the topic
