Reasons why it might not be as bad as we think:
- We just have one screenshot of one dwemer city, there might be a lot of metal buildings/elements outside of our view (in another city or somewhere in this city)
- The inside could be fully metal.
- The city is far away from Vvardenfell, thus building styles could just be different. We also see this in cultures in our world.
- The city could be taken over by the Nords, and since the disappearance of the Dwarves is 240+ years ago they had a lot of time to restyle the place.
- Maybe there is not so much metal available in that area of Skyrim, or maybe they require the heat of the mountain like some guy said before
- The shapes of the buildings are, like another person said, quite like the stone shapes of the buildings in Morrowind.
So, no reason to panic! Except there's one more explanation...
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Maybe the world of Nirn is the world before LotR (explaining why everything becomes more and more lotrlike, which is before history. So TES is pre-prehistory!
O no!