I bet LittleFinger winds up on the throne at least for a short while. He has the Vail, and we be Warden of the North after he takes out the Boltons. That will be a lot of manpower, then the Tyrells and Lannisters may be fighting each other and the Lannisters may also want to be fighting Dorne, then LittleFinger comes in and takes Kings Landing from whoever is weak from the fighting. Then eventually gets rekt by Dany or is smart enough to join her side