You really can't think of an excuse to bring them back?
"Thirty dwarves were doing research in a realm of Oblivion when the tools were used and the heart was pierced. Those thirty dwarves returned to find their people vanished, and their Falmer slaves running amok. They sealed themselves in one of their deepest cities to protect themselves from the Falmer, and in the thousands of years since have grown to a sizable population. Also, they are shorter now because thousands of years and a bottlenecked population can do that."
Boom. Dwarves.
As far as Yagrum knew he was the only one. He searched for a long time, and not only on Tamriel.
Vivec said he could detect no trace of them in any world.
Of course, something like you say might very well be done, if the people in charge find it interesting enough.
Im just saying that it would be a retcon.
Myself I am of the opinion that the Dwemer are better left gone. Any attempt to bring them back, no matter how well done will inevitably ruin their mystery, their specialness, because it will lock them in one role, instead of the myriad of fancyful imaginings and speculations we may have.