For everybody that worries about the story being illogical or incomplete I'll give a brief summary of how the last three episodes will go:
Obviously what's going to happen next is a fight with Cersei and her Golden Company. Daenerys will initially take the advantage in this battle by defeating the Golden Company with her dragons (although Viserion dies), but what she doesn't know is that Sansa has become increasingly worried that the North will suffer under Targaryen rule. So she makes a deal with Cersei, in which Sansa is allowed to keep the North if she agrees on the plan to betray Daenerys. To execute the plan Sansa sends her lifeguard Ser Brienne on a mission to take out Daenerys, which ultimately succeeds when Jaime Lannister stabs Daenerys to save Brienne's life. So now the Kingslayer has also become the Queenslayer.
Of course Jon Snow is devastated by this betrayal and the loss of Daenerys. As a result he wants to take revenge and becomes the new Mad King as he takes Rhaegar to fly to King's Landing and burns the whole city to the ground. Jaime has returned to King's Landing to try to rescue Cersei, but Bronn kills Jaime to take the promised gold by Qyburn. Cersei now has lost everything and commits suicide by wildfire. Jon Snow has fullly transformed into Aegon Targaryen and even Sam isn't able to talk sense in him as he travels towards Winterfell to meet Sansa and burns every village in his way. Arriving at Winterfell he encounters Arya in the courtyard, who takes him out in a superb fight.
By this death of the last Targaryen all magic in the world including the last dragon disappears. Bran comes back to normal and loses the gifts of the three-eyed-raven. Now Sansa leaves for King's Landing to become the new Queen of the Seven Kingdoms with Tyrion as her Hand of the Queen and Brienne as Commander of the Kingsguard. Arya will be the new Warden of the North, protector of Winterfell, and marries Gendry. Sam marries Gilly and returns home. Grey Worm and Missandei marry and head back to Meereen. The Hound gets his opportunity to finish his brother the Mountain, while Tormund, Varys and Davos all happily leave Winterfell now that the Game of Thrones has ended and peace has been restored. The end.