I think GRRM is raking in too much cash from TV to have time to really contemplate the myriad consequences of all the mixed loyalties and character crossings the story has entangled. I'm not surprised the books haven't been finished, and the TV series now seems to have the pedal to the metal with plot development, since they are out of time.

Disclaimer- I'm a mere show-watcher, and avid reader of gameofthrones.wikia.com :-)