IDK man. It seems apparent they don't operate on the timescale of Men. I would bet its a case of Blue and Orange morality or something like that. Years later they haven't attacked the wall?And where are the Others anyways? In season 1 the cliffhanger was a giant undead army Sam spotted... years later they haven't approached the wall.
Slowest army ever?
Why didn't they attack 7000 years ago a millenia after they lost the first War for the Dawn?