We know they won't kill Klaus as then Marcel and all of our heroes of TVD will die! But it still begs the question: Will Rebekah help Marcel? Or will she stick with Klaus if only just to help Elijah and Hayley? I that now since Marcel knows about the baby and that it can make hybrids, he would let Hayley live. Rebekah may hate Klaus but she has grown really fond of Hayley and Elijah would be upset if Rebekah was the cause Hayley and the baby's death.
What do you think?