In order to understand why this makes so much sense, let's first let's deconstruct Maggy the Frog's ominous prophecy. "You will wed the king." Cersei married Robert Baratheon after he usurped the crown from the Targaryen dynasty. So, check! "Queen you shall be ... until there comes another, younger and more beautiful, to cast you down and take what you hold dear." Margaery Tyrell married King Joffrey and thereby became Queen of the Seven Kingdoms. So, again, check. "Six-and-ten for him, and three for you. Gold shall be their crowns and gold their shrouds." King Robert was a notorious womanizer in King's Landing, and as we saw in Season 1, he sired a lot of bastards — all of whom are now dead, except for one (Gendry). Cersei, however, gave birth to three children, and although they took the name Baratheon, they were biologically Jaime's children. Once again, Maggy the Frog nailed it.
But there's still one part of the prophecy we haven't addressed: Cersei's death. "When your tears have drowned you, the valonqar shall wrap his hands about your pale white throat and choke the life from you," Maggy said. Valonqar is a High Valyrian word for "little brother." As we know, both Jaime and Tyrion are technically Cersei's little brothers. She's lived her entire life believing that Tyrion would be the one to choke the life from her, but really, it's starting to look like that honor belongs to the Kingslayer himself, Jaime Lannister. After all, Cersei's last bit of humanity flew out of the window with Tommen; she's now a ruthless queen with caches of wildfire at her disposal. Jaime isn't going to be down with that.
12. IS ANYONE ACTUALLY PREPARED FOR WINTER?
Despite its name, "The Winds of Winter" had zero ice zombies, which was a bit of a bummer for those of us who like the Night's King. But it did formally announce the start of winter, which can't bode well for the lords of Westeros. (Except for Lyanna Mormont, who seems to have shit under control.) The War of the Five Kings really fucked them. All that squabbling over the Iron Throne has left them approximately no time to prepare for winter, and from what we've heard, winters in Westeros can be long, dark, and brutal. Not to mention, winter is the perfect time for the White Walkers to strike -- and with Bran knocking on Castle Black's door, things don't look good for humanity.
11. IS ANYONE WORRIED ABOUT THE HORDE OF WHITE WALKERS HEADED SOUTH?
Again, everyone seems a little distracted at the moment to care about the army of undead that's headed their way, even Jon Snow, the newly appointed King in the North. In fact, the only person who has his priorities straight is Sam, who finally made it to the Citadel in Oldtown. We know he's there to look for anything that could help Jon in his fight against the Night's King. But he really better hurry. If Bran's mark could destroy the magical barrier protecting the Three-Eyed Raven, there's no telling what it could do to the Wall. Actually, wait, we know what it's going to do to the Wall: destroy it.