The Dwemer could already live forever without Corprus, Yagrum was just unlucky in catching the disease while trying to find any other Dwemer in who did not become instant ashpiles when Kagrenac struck the heart of Shor. The whole point of the Numidium was to be able to exist from Kalpa to Kalpa. If they came back as Yagrum clones, they would be genetically Dwemer, but they would not be Tonal Architects and powerful Mystics, they would be one more Elven variant in a Bethesda Game.
One or two could possibly be trapped somewhere, or a persona stuck in the body of an Animicula trapped in a chamber in some remote ruin.
The Numidium still exists, so the Dwemer can always be brought back to stomp around Summerset Isles (again), but as a race of immortal ubermer they are gone until the next Elder Scrolls game.