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The dragon glass comes from the fire (volcanoes). Fire is the only way these things can be destroyed so I'd guess dragon glass is their kryptonite.
Don't think they're skipping a plot point. White Walkers just an interesting side story anyway, giving credence to the importance of the wall and those who protect it. Who is protecting that damn thing now anyway?
I highly doubt they are just a sub plot when you consider all the things that are happening at the same time for the first time in centuries. My guess is the rising of the dead is the catalyst for almost everything else that's happening in the story. Or something set off the dead, which ultimately leads to everything else.
Kind of like how the Mongols shaped Chinese history, and the Great Wall. (the author is leaning heavily on the middle ages, and mixing European and Asian history nicely, with a sprinkle of all the best legends and fables)