Oh I think he dies like what you are saying so he can be released from the TNW but we have no clue to Brann's powers and I am thinking Jon's revival will show case Bran's powers and what he has learned from the three eye raven. I just think to much has been put on that Raven talking to Jon and IMO the Raven was skin changed by the three eyed raven watching Jon.
I think Mel has lost some powers and other then Renly B what has she really done to prove she is powerful. Robb and Joferry deaths are very explainable. IMO bringing Jon back like LSH or Dondarion is not the answer.
I don't think Mel has lost her powers, I just think she's kind of dim witted and cant read what the flames show her. She has the power to see the future in the flames, she just keeps assuming the visions mean something other than what they really do. She sees the Bolton banners burn, and assumes its Stannis that defeats them. That could be happening further in the future by some other army. Hell she keeps asking to see whatsisname reborn and it shows her JS, and she is too dimwitted to figure it out. She asked for a thaw my burning Shireen and got it. She asked that Rob, Joffy and Greyjoy die and 2 did very quickly (are we to read anything into the fact that Greyjoy hasn't yet in the show or was that sloppy HBO writing?), she squirted out a demon smoke baby (2 I think in the book?).
Chick's got the gift, chick's just dumb.