For many, the survival of Jon Snow (Kit Harington) seems inevitable. After all, George R.R. Martin's book series is called A Song of Ice and Fire, and he is thought to represent the colder part of that narrative, while Daenerys is in a more literal sense the fire element. And even though he has now been confirmed as a descendant of both the Stark and Targaryen lines, we still don't know if he is the fabled Azor Ahai a.k.a. "The Prince that was Promised." In fact, Melisandre even believes it may be a princess who fulfills that prophecy. Jon very well may become a dragon rider before it's all said and done, but unless he has dragon blood like his aunt-slash-lover Daenerys, we'd give her the edge on ultimately winning the game for Westeros.
We'll find out if any of these grim predictions prove true when Game of Thrones returns to HBO in 2019.