Hrmmm. Much as GRRM might be setting up a new status quo, I see a few issues...
For one, he has spent a considerable amount of time, when not killing off characters in the political machinations, building up the mythos in four key areas:
1. The North (Ice) - The White Walkers and zombies clearly have a lengthy history which much time has been spent setting them up as the unseen menace for which Westeros had better get its **** together. It would be a very strange conclusion indeed if the books concluded without addressing that part of the story in the slightest.
2. The Targaryens and the Dragons - The primary matter of tangible 'Fire' we see in the books, while Daenerys is set up as a political figure, she's also being created as a mythological one. Moreover, we now actually have the trifecta of Targaryens like those of old - Daenerys, Aegon, and Jon Snow (because I'm bloody positive at this point that Snow is the lovechild of Lyanna and Rhaegar, though GRRM may twist that just to screw with us), repeating the old cycle of the Targaryens come to save Westeros.
3. The Lord of Light - Melisandre and her Lord of Light appear to be on a collision course with Jon Snow, making me see her linked up to the Targaryen forces in the not distant future.
4. The Drowned God - Again, there are links forming between those following the Drowned God and the Targaryen forces that allude toward a role in a greater world-altering battle.
I think GRRM has passed the point of no return on effectively resolving matters in Westeros to set up a status quo to face the final threat. He has spent far too much time world-building and hinting to leave it unresolved and still craft a meaningful and satisfying conclusion to the series. There are too many connections and long-term machinations to simply leave it without addressing the conflict of ice and fire, and to do that justice I suspect is either going to require at least 3 more books, or two very, very long ones.
Like I said before, I think GRRM has written himself into a corner. There is hope, however; if GRRM's health does fail before the completion of the series, Brandon Sanderson has already admirably demonstrated that he can finish someone else's series just as well (and possibly better) than the original author
