I can dream can't I? The only reason I want them to return is the fact we need another playable race, I could settle for Imga or Maormer. We need a new race somehow but you do realize that strange things have happened in the TES universe/Lore so you can't exactly throw the idea of them coming back out the window because like I said stranger things have happened...
Numidium would have to be unmade somehow.
Even if that was possible, it blew up in Daggerfall.
The blades are more or less defunct, if they ever attempted to collect all the pieces again (They did it once before) that endevour would have become lost when they were nearly wiped out by the Thalmor.
I personally would not mind a DLC or even a game set in the deep past where the Dwemer were still alive.
They are too strange to be a playable race though, and I dont think you would get much meaningful conversation out of them even if they were just there as NPC's.
-Hello, I am the adventurer.
- Halt. Impossipoint aquisition/ reproduction/ exotic. Query.
-I.. I dont understand.
- Exotic. Nilgularity processment primary flux established. Would you like some tea?
-I.. I think Im going to go now.
- Azura. Through the gates of Dawn destiny lies. Goodbye.