I assumed that's where its going, but is that really what the story is about? Or is it about winter coming and the white walkers with it? And no fucking spoilers if you know.
I don't know. But I think it's about all of what you said. I think Winter comes, the white walkers kick ass, and somehow Jon Snow and Daenarys have to have an epic fuck to set the world back to normal again. Only Jon Snow lives on as the king of westeros.
Based on no spoilers or anything more than what have been in the shows so far.