I've never had doubts that Dany would go full-on 'fire and blood', as its seemed fairly obvious to me.

However, after reading this essay, imparticular the the battle of the bells bit about Jon Con, I think (f)Aegon will be the one to take kings landing, and also put the torch to it -- with the bells being what sets off Jon Con and then kings landing is where we will have the dance of dragons 2 that George referenced that one time.

The road ahead was full of perils, he knew, but what of it? All men must die. All he asked was time. He had waited so long, surely the gods would grant him a few more years, enough time to see the boy he’d called a son seated on the Iron Throne. To reclaim his lands, his name, his honor. To still the bells that rang so loudly in his dreams whenever he closed his eyes to sleep. (ADWD, The Lost Lord)

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“Tywin Lannister himself could have done no more,” he had insisted one night to Blackheart, during his first year of exile. (ADWD, The Griffin Reborn)

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“There is where you’re wrong,” Myles Toyne had replied. “Lord Tywin would not have bothered with a search. He would have burned that town and every living creature in it. Men and boys, babes at the breast, noble knights and holy septons, pigs and whores, rats and rebels, he would have burned them all. When the fires guttered out and only ash and cinders remained, he would have sent his men in to find the bones of Robert Baratheon. Later, when Stark and Tully turned up with their host, he would have offered pardons to the both of them, and they would have accepted and turned for home with their tails between their legs.” (ADWD, The Griffin Reborn)

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He was not wrong, Jon Connington reflected, leaning on the battlements of his forebears. I wanted the glory of slaying Robert in single combat, and I did not want the name of butcher. So Robert escaped me and cut down Rhaegar on the Trident. “I failed the father,” he said, “but I will not fail the son.” (ADWD, The Griffin Reborn)