But seriously, my take on Bran’s powers is that with the ability to see all of time, it’s like trying to sift through sand to see something specific. Also, maybe since there’s some sort of tie to the weirwoods, it gets harder to see stuff when you go further south? Or you know, he didn't see it because it's what the writers needed to happen.
Originally in the books, Bran was able to see through the faces of the weirdwood trees. That was how he was able to see his father during the events of the first book. I don't think there is a weirwood at King's Landing, thus explaining the limits to his sight. But it has not been established well in the show. I think after episode 3 we won't see Bran do anything useful any more in the show.
The show seems to struggle with bending the plot and its characters towards the place where they want it to end, which explains why a lot of viewers seem annoyed with how some of the characters are behaving. It feels all rather forced. I wonder if this is where George RR Martin actually intends to take his story, or if this ending is show only. Heck, maybe George has no idea how he wants it to end, and gave the show runners card blanche to do whatever.
My predictions:
-A happy ending doesn't seem likely at this point. The show will probably end with the death of Jon, Dany or both.
-Dany's vision showed a destroyed throne room, and Bran's vision showed a shadow of a dragon over King's Landing. These things will probably come to pass in these last two episodes.
-Clegane Bowl has to happen, that's a given. But I'll take it a step further. I predict that we'll see the Hound perform some kind of miracle tied to the Lord of Light. Maybe he will conjure up a burning sword of his own, or maybe he'll bring someone back from the dead.
-Jamie is going to die, as is Cersei. I feel the story should end with Jamie's hands around Cersei's neck, but it is also likely they will die in each other's arms.
-I think Jamie may have a personal confrontation/fight with Euron. They've already set up their rivalry in the show.
-I wonder if there is going to be some kind of pay off regarding some of the characters that Cersei has locked up in the black cells underneath King's Landing.
-I wonder if the secret passage that Tyrion used to escape the Red Keep (after killing his father) will come into play to break into the Red Keep.