I think Jim has hinted that one option for the series is to just wrap things up, particularly if he becomes unable to continue via sickness, etc. So in that case, Murphy's further story and his plans for her may just not make it into the series.
Or fans, be careful for what you wish for, you may get it.. By that I mean, just because Jim says Murphy may be back at some point,I don't think it will be that simple. It's her, but it isn't
her any longer, she is Einherjar now and I doubt that it will be satisfying for either Harry or you. The Allfather's rules are meant to be a kindness to the living, there is a good reason for them. Gard accepts those rules and understands them. If anyone should have pull with Odin, you'd think she'd be one of them. She did love Hendricks, but she isn't wishing him back.