Theoretically, it could be done. But three big reasons. Money. Costs to raise vs scrap just aren't there. It's a very large ship. There would have to be underwater cutting done, or a nightmare level of inflatable bag straps. Any of the straps fail and your back to the bottom or it's in a different position and you'll start all over. It's a mass grave site. Any of these reasons alone are enough. I don't think the depth is as much of a problem anymore, because submersible robots would be doing all the work at that depth. If it was a government ship, it would only stay down there due to the fact that the tech is turn of the century. These days, they would bring it back up.