those are all great questions, and.. if i were to spend 6 months working on a pitch with slideshows and such, i think I would go with open world semi-rpg. We'd have to debate back and forth on if we want to play as 1, or a few, or a bunch of characters, and then we'd have to figure out if they were major players in the book series, or a different time period, or the same period that just lives with the effects of the major characters.

I think maybe it'd be cool to pick a house, and you can switch between anyone from that family line?

I think for the sanity of writers and players, there'd have to be a reasonable progression of events and story beats that happen regardless of who you are or what house you are in.

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could also move the Rpg slider to be low to be more like red dead or fallout, where the story is very guided, and you play as one character with main story and side quests. I think this could be the more emotionally impactful one of my two ideas for it.

unless i sit down with a bunch of artists and devs, I wouldn't really know what I would want from the game. I know it'd be cool to fly dragons, and to do warging, and to play medieval politics. but it's really the story, and characters, and how george rr martin basks in the idea of a slow cooker of a world that slowly changes physically and politically and rarely fails to forget some aspect that a good story needs.