re: Who will finally sit on the throne by the end?

It will end with Robin Arryn on the throne and the camera will pan out to show King’s Landing and the Red Keep as the snow is falling. Then it will pan out further and we see Robin on the floor playing with a snow globe in a modest, blue-collar home in the current year.

His father, who appears to be Littlefinger, will gently tell him, “be careful with that son. Remember I told you that,” as he kneels down on the floor next to him. Robin is unresponsive and continues to stare into the snow globe.

In the background is Robin’s grandfather, who appears to be Tywin Lannister. Robin’s father says to him, “I don’t understand this autism thing, Pop. Here’s my son, I talk to him, I don’t even know if he can hear me. He sits there all day long in his own world staring at that toy. What’s he thinking about?”

Robin continues shaking and staring at the globe. Finally, his father reaches out and takes it from him saying, “Alright come on, Son. Let’s go wash our hands.” Robin stands as the three of them make their way to the kitchen. Robin’s father places the globe on a shelf and we zoom into it and see that it is the Red Keep.

Cut to black.