I'm not completely sold he'll die in the show like in the book the more I think about it. They're making him way too important. And if he doesn't burn it won't be because he is a targ, that's a big misconception. Targ's burn like everyone else, several have died from burning. Danny didn't burn due to all the magic and sorcery with the gypsy witch that she was burning, that or she is unique and AA, which I believe. She was born in salt, one of the worst storms of their time on Dragonstone, and again in smoke with her dragons, plus the red comet immediately after their hatching. I don't know if Lightbridge will be an actual sword or if it will be dragon but she will kill Jorah or Dario to fulfill the prophecy. If Jon is indeed AA then it will be Arya that he kills with Longclaw while shes under disguise as a faceless man.