Game of Thrones End Game Theory

The other night I had an epiphany about how the show would end. Various forces including Daenerys, Tyrion, Jon Snow, and possibly Stannis, Bran, Sansa, Aria, and Jamie Lannister, will all battle the Night King with the Dragons and the using swords melted into the Iron Throne itself. The discovery that Valerian steel kills White Walkers will make the need for the steel great and where else can a significant amount be found other than the Iron Throne? Plus, the revolutionary aspect of Dany's journey suggests that the end of the show might usher in a new form of government to Westeros. The melting down of the Iron Throne would be symbolically rich end of the show. Also, I can see Jon Snow flying one of the other dragons, revealing himself to have Targaryen blood and perhaps also Bran, using his warg skillz. But those are just details.