the only exception would be....the foreshadowing Edward told in BD...remember when Edward mentioned that Nessie is the only other of his kind that wasn't his sister? This character's name has slipped my mind for the moment...nuel...or something like that...I don't have my book here with me to reference lol....but could we see a love triangle forming in the future...like mother like daughter? Of course Jacob is what is perfect for Nessie...but a girl can change her mind. What a story that could make...Nuel's army of half vampires/sisters battling with the pack...over Nessie. hmmm, ideas!
The bond between Jacob and Renesmee is far stronger than the bonds of marriage. But I don't see any reason why they wouldn't just make things official. Surely Edward and Bella would want nothing more than to make their Nessie happy...and that would mean allowing her to have Jacob.
I think Tey will get married! It is quite to depressing to think that Jacob will get marreid (I'm team Jacob!) But it ture! He has to marry her. He will love no one eles becasue he has imprinted on her! So they have to get married!!!!