I'm predicting:
1. Jon kills Grey Worm and Dany
2. Arya kills Drogon with Bran's aide (the dragons are the nukes of Westeros and need to come to an end)
3. The Iron Throne is dissolved and each kingdom is self-ruling but Tyrion will govern the South from a rebuilt King's Landing, Sansa will rule the North, etc.
4. Jon goes north, beyond the wall, to live with Ghost in peace (much like a wounded Frodo goes to the Undying Lands in The Lords of the Rings)