I have a feeling that if any character who's not named Salem is going to be able to kill off Qrow, it's going to be Raven. Not only does she have the power and means for it, but Qrow no longer considers her family and she desparately wants to be left out of the war between Salem and Ozpin so bad, she would probably soon be willing to KILL Qrow just to make it clear that she's DONE.