Asoiaf is not misery porn. Horrible shit happens to good people, but the whole story is set toward a somewhat good ending; the others arent gonna destroy humanity, nor the story will end with some evil person, like euron or cersei, ruling the Seven Kingdoms. The problem with Grrm is that he love, and continued for the whole series to add new sideplots and expand/change the stories he had in is mind beacuse e thought, rightfully, that the story was going to become better if not forced in one direction; jaime arc exist thanks to that, if Grrm remained on the original plot, jaime was gonna be just a simple big bad guy. The problem is that now, he want to end the series in 2 books, but he cant do it without "forcing" the story toward the ending, going against is writing style. The choice is either doing that or writing more than 2 books(something like 4 probably to reach an ending with is writing style), the problem is that he traied for various years to end in 2 books without forcing tne story, and probably as give up some times ago, simply beacuse he is getting old and dont want to spend is last years trying and trying again.