Idk if it is writers block or not, because GRRM seems to crank out a book every 5 years, and the last one was in 2011 so he isn't quite off pace yet.
As for all the fan theories on YouTube and such, most are dumb but every now and then there is a really interesting one that gets it exactly right. The R+L=J theory was being talked about crazy early.
I saw an interesting one that paralleled most of the 7 Starks to a corrupted form of "The Seven." It was extremely interesting!
I.e. Ned = The Father, just and honest, but ultimately executed as traitor.
Catelyn = The Mother. Loving and kind, ultimately rendered powerless as all her children are torn away from her.
Sansa = The Maiden, pure and chaste. Becomes a cold calculating player in the Game who sees the world as it truly is.
Arya = the Stranger aka Death. Goes to become an assassin and has a hit list. Ends up abandoning her training.
Rob = The Warrior. Mighty and brave, wins many battles and a strong leader. Betrayed and murdered at a feast, unarmed and helpless.
I'm a nerd