The game of thrones is never over. Wrapping it all up neatly would be the worst possible ending. I don't see how you wrap up the struggle for the throne before the threat of the others is dealt with.
Which is the main story -- Who sits on the Iron Throne, or what lurks beyond the Wall? Are the Others a side-story to the Iron Throne, or is the Iron Throne a side-story to the Others? I'm of the opinion that the Iron Throne is just a sideshow to the main event -- Ice (the White Walkers) versus Fire (Dragons) -- so therefore the Iron Throne has
to be wrapped up first and in such a way that it both feels like closure and
an "Oh, shit!" moment as characters realize there's a much bigger threat on the horizon.
, that does sound "so ... generic," but that's also basic narrative structure -- a situation is overcome, revealing a new plot complication. It may seem like there's a lot going on in Game of Thrones
-- it's dense, there's a fuckton of characters -- but much of it is misdirection and obfuscation, and it's not going to matter in the end. My thoughts on what seasons six and seven will probably look like isn't any more generic than what we've had thus far or anything Martin's written.