Theories:
1 – Dany. The various power players will decide as hard as that may be to stomach, it wouldn’t be worth putting the kingdom through yet another war for the throne.
2 – Jon Snow. He pretends like he’s cool with it then kills his aunt with his penis….or somehow uses sex as a pretext to get close and kill her or something.
3 – Invasion from Afar – Arya said a couple seasons ago that there was land far away that no one from Westeros had explored. I felt like that was a big thing to just leave dangling there. So maybe an army from far away will land and take it all.
4 – Jon Snow and then a governing counsel after he croaks.
5 – No throne. It goes straight to a governing counsel.
6 – Sansa – I think she’s like the oldest member of any remaining house that isn’t a bastard or a three-eyed raven.
7- Varys. He would never let himself get burned up like that. He had a stunt double get burned.
8 – Littlefinger. He also would have never been bested. He had a stunt double killed in his stead.
9 – Arya will use her faceless man skills to pretend she is Jon Snow at her chamber on the pretense that he needs khaleesi sex. Once in, Arya will reveal herself and chop up Dany to pieces.
10 – Ser Davos because why not.
11 – Tyion because why not.
12 – Governing council – Tyrion, Snow, Davos, Greyworm.
13 – Greyworm.
14 – Nobody is left.
15 – It’ll be like the ending of Hamlet where an outside invader enters the castle only to find everyone is already dead.
Who do you think will sit on the iron throne, 3.5 readers?
Bookshelf Battle 
What about Bronn? He was promised a castle, why not King’s Landing?
It could be. I’ve been rewatching the old episodes. I forgot how early on in the series he came on. He also has a guest appearance in John Wick 3.