Bring back Steller's Sea Cow?

"De-extinction" is talked about a lot these days, with the woolly mammoth being a favorite candidate.  This 2014 article in the scientific blog SeaMonster just caught my attention.  Could we do it with Steller's sea cow?
This history of the incredible animal named Hydrodamalis gigas is a short one as far as science is concerned. In 1741, naturalist Georg Wilhelm Steller was shipwrecked on Bering Island.  This is one of the Komandorski Islands,  between Kamchatka and the Aleutians.  There he and his companions met the sea cow.  It was a huge plant-eating mammal, up to 10m long, with a bilobed tail like a whale's and a placid disposition that made it easy to approach or harpoon.  The rough-skinned creatures were also loyal, gathering around an injured animal.  That instinct, while admirable, did little to promote their survival.  
After Steller's crew finally returned to civilization, sealers and other voyagers began stopping off in the sea cow's haunts to slaughter the inoffensive mammals for their meat.   By 1768, the species had apparently been hunted to extinction.
There have been a few reported sightings since then.  Native hunters reported killing them as late as 1780.  Early Russian colonizers of Bering Island reported sighting sea cows in the 1830s.  Fifty years later, the explorer Nordenskiold returned from the region with a sea cow skeleton of unknown age and a tale of a live sighting from 1854.  In 1910, fishermen in Russia's Gulf of Anadyr reported a sea cow stranded on the beach, but the report was never investigated. 
Can we bring it back? The article does not actually say anything about it.  There is some non-fossil skeletal material that can be checked for DNA. One of the lesser surviving cousins, the dugong or the West Indian manatee, would have to serve as surrogates,  My answer would be that we couldn't do it now, but in ten years or so,  we might.  Should we? It would not be tampering with nature, but restoring a species humans wiped out.  Questions about breeding such animals in captivity and re-establishing an ocean population are many, with money being a big one.  But it's food for thought.

Some other sources:
Dietz, Tim.  1992.  The Call of the Siren. Golden, CO: Fulcrum Publishing.
Haley, Delphine.  1978.  "The Saga of Steller's Sea Cow," Natural History, November.
Mackal, Roy.  1980.  Searching for Hidden Animals.  New York: Doubleday. 
Stejneger, Leonhard.  1936.  Georg Wilhelm Steller.  Cambridge, MA: Harvard University Press.