thats because the entire race disappeared at once in one instant... do you think because they left all their bowls and bedding out that the people of Pompey are just bidding their time to come back? no.
Pompeii had a volcano, they didn't just disappear...
The last two installments of TES have been about somebody who has appeared out of nowhere (player) and everyone is just like, "OMG you're of the Gods", something or other coming to Tamriel, scaring the sh*** out of everyone, for the Dovahkiin/Champion of Cyrodiil to destroy, and the bad things having crazy people who worship it/them (Mythic Dawn/Greybeards). Why not spice it up a bit by adding a new story line?
Maybe the dwemer reappear, say 50 years after Skyrim, and start to repopulate the ruins. Maybe some crazy people (TES' trademark item... CRAZY PEOPLE!!) build a third Numidium made of godly objects only for it to turn bad and the gods needing to take part in destroying the object, whatever. OOh, good storyline.