What are your thoughts on that post:
“insane to me how the key five stuff is so endemic in the fandom when sansa and CATELYN WHO DIED IN ASOS both have more chapters than bran.”
I think it's another case of people acting as though their interpretation of the books is more important then the story being told. If the concept of the "key five" came from fans that would be one thing, but it comes from George himself. He has stated multiple times how he has know their endings since the beginning. So even IF (big if) they are no longer meant to be the main characters, there would still be a distinction between them and the other characters.
Personally I don't see chapter count as the sole indicator of who the Key Five are and definitely not when we still have two books left in the series. It's impossible to tell what the final chapter count will be. But let's say that was the case, that chapter count was that important. We would still have the "Key" characters with Tyrion (49 Chapters), Jon (42 Chapters), Arya (34 Chapters), and Dany (31 chapters) and I doubt that was the point they were making.
Either way It's obvious that Bran is being setup to have an extremely important role in the upcoming books. Having a four chapter difference between Catelyn/Sansa doesn't really mean much, especially when their POVs are often used as a camera to let us know the actions of non-POV characters. There's a big difference in the actual story content and narrative importance between the characters. This fandom also has a bad habit with reducing and inflating character's importance based on their opinions, so it doesn't surprise me that people dislike the idea of Key Five characters when their fave isn't a part of it.