I suppose that Asshai is the opposite of the Lands of Always Winter and the Lord of Light is an actual being that is residing on the ASOIF Earth. It could be very possible that Dany is a sort of Anti-Christ (not necessarily evil) and Jon Snow is a Christ like figure who brings balance once the White Walker King is defeated and Dany begins her world conquest.
GRRM could be using the Good-Evil, Light-Dark, Fire-Ice, Black-White literary dichotomies against the reader, and introduce a three pronged or trident like system to completely throw us off. Jon Snow could be destined to save and lead Man (on a different level than how Christianity views Jesus, or Judaism views the coming Messiah) and institute Old School Westerosi Polytheism while Dany is the tool of the Light and magic and rule everybody under the banner of Monotheism while the Whitewalker King is a tool of what would constitute Hades destroying everything and having essentially a Snowball Earth.
Or I could be dead wrong and Jon's dead dead, and Dany remains the Autocrat of Mereen until she is overthrown or dies while in power, while Westeros suffers a major human catastrophe and becomes a zombie continent (since it looks like the Others can't seem manage to get on a boat and hop onto an new island or new land). But that would really suck and that standoff stare between the Zombie King and Jon "don't call me Jesus" Snow, Tombstone style, was just a teasing waste.