One of the dragons had to die somehow. Having two dragons tips the scales too much in Jon/Daenerys' favour, so the show had to come up with some way to even the playing field. It's total BS but whatever, it's better than having a giant battle at the end where the dragons, who are perfectly capable of roasting everyone in a matter of minutes, don't melt the city.
I'm pretty excited at the prospect of one giant, final battle for the realm taking place on multiple fronts, where almost everyone dies.
My money is on Sansa somehow taking the iron throne (maybe with Tyrion?), Daenerys and Cersei both die a gruesome death at the hands of Varys, John moves back to Winterfell to be close to his drinking buddy Tormund, Bran goes with, and Arya feks off to Braavos to get her stab on.
Drogon takes off somewhere with a broken heart like a lost puppy dog never to be seen again.
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