atleast they keep the dwemmer dead...so far
Nope. TES III: Morrowind had an actual live Dwemer in it, Yagrum Bagarn. He said he thinks he was able to avoid the fate of the other Dwemer, because he was in the Outer Planes at the time that Kagrenac tapped into the Heart of Lorkhan. However, upon returning to Tamriel he caught Corprus and became the fat, corpulent slob with the lower body of a Dwemer Spider. You also find Dwemer Specters in several of the Dwemer Ruins, you even talk to one in Tribunal.
Plus, in TES V: Skyrim, the Master Conjuration Trainer, Falion, mentions that he's met and conversed with Dwemer while traveling the Outer Planes. So technically, they're still around. Just not on Nirn.