I have read some speculation but not a lot. This just makes sense to me. Dany, Tyrion and Jon Snow (until last night.....maybe) have been three large pivot points around so much that has happened. All the other is just life, important yes but not the important thing. I could be totally wrong here, there are so many characters out there that have a lot of story left I think, Arya and Sansa and Bran of course.
There are 3 dragons. Dany, Tyrion and who else will ride them?
Just watch, first episode next season Tyrion will be eaten by a dragon and there goes that.
GRRM hates us THAT much! I still have not forgiven him for Ned, I will never forgive him if Jon Snow died not knowing who his mother was and if he offs Tyrion I probably will just roll over and give up. 
Brilliant, incredibly complex books with a story that has mesmerized so many people.
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