Doesn't a Jonerys marriage essentially make the story about the Targareyns? I'm a big believer in that this story is about the Starks. While there are main characters from other families, the story is about the Starks. It began with them. It will end with them. Jon's journey is about being a Stark. Him marrying Dany and them ruling Westeros together makes the story about the Targareyns. What does that do for Ned and his story? Nothing.