Whatever Sansa does little finger will be controlling behind the scenes. With so many of the top people dead...either he or Mace Tyrell is the most powerful man in the kingdoms now. Or the priunce of Dorne I guess since he has friends coming.
But Bolton is fighting Ironmen and Stannis....no idea who rules the west now...or the kingdom in general(Mace I guess).
Littleginfer is gonna quietly take over Riverrun and the North. The Freys are in the way but I somehow doubt Frey ends up lord of westeros.