I don't see the build up for such a "final storyline" for Murphy, though. Susan had a lot of things going on which led to her ultimate act of self-sacrifice. Murphy, at this time, is reconvelascing from her wounds and needs to adapt to her current situation. Her and Harry difnally being able to have a romantic relationship is still building up. I just don't see her character arc making her be someone to be taken out of the story.
You could be right, however just a reminder, in the trailer we had a scene where Murphy was removing her cast. I doubt she was doing that because it was making her itch. So obviously in Murphy fashion she is going to try and go out to fight along side of Harry or to save Harry. Now she might find sans cast she isn't going anywhere.. Or she goes and is ineffective because she is about forty percent physically able to do so, gets further injured or killed in the process. What would really be phony is suddenly by some miracle she is fully healed. As far as her doing things that could lead to her demise, she isn't unlike Susan in that. Only difference between them there is Murphy is a well trained warrior both in hand to hand and with a fire arm, Susan wasn't. Once she got vamp power she was better for sure, but Susan was never trained in combat. Now Murphy can still shoot, but that depends on whether or not she can physically get herself in position to fight. Part of what has made her attractive to a lot of her fans is her ability to kick ass, if she becomes confined to a "desk" job or equivalent, things could change. Actually there are hints in the chapter that if she has to adjust to that it isn't going to be easy for her, and it will affect her relationship with Harry. In my
opinion Jim has been struggling with what to do with her since she was removed from the police force. I guess he could make her a police chief, that might work.
It is possible but you need a lot of power and you might get a mantle of some sort and those things don't come cheap. That is the Faustian deal mentioned.
But maybe you can encourage healing with magic. Elaine did something small in white night and I imagine Listen to Winds knows all about it. It must be possible to help the regeneration process a bit.
There in lies the rub as they say, Murphy cannot stand to be controlled by anyone, she has her own ideas so a Faustian bargain would spell disaster for her.
What Elaine did with Harry if that what you are talking about wasn't so much magic as kind of a yoga treatment to relieve Harry's head pain. I have to go back to reread that, but I believe that is what she said, don't think it could heal the real damage Murphy suffered. Also keep in mind she was doing her thing on another wizard.