FYI the official name for GRRM's series of books is "A Song of Ice and Fire", and there's an underlying theme of the eternal struggle between fire and ice. And yes, the White Walkers and the dragons do seem to be the embodiment of either extreme, so you got it in one!
And yes, the show is largely about the War of Five Kings and Two Queens and the neverending warfare between the clans of Westeros, but the underlying threat of the Zombie Apocalypse has been there since the first episode, and is what gives the show its overall dramatic arc. Yes, a show about the eternal quarrels of the Westerosi aristocracy could go on forever, but people would get sick of people picking fights and starting pointless wars after a while- they'd start realizing that the characters are just a bunch of violent jerks. Well, because of the White Walkers the characters are all going to get a big reality check and forget their petty quarrels as they all struggle to save all living things. And after the world is changed and saved, of course they'll go back to fighting all the time, and that's the moment to ring down the curtain because the fighting won't be fun any more.
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