I do not think that a USAI/DIS combo would work for Diller. Neither he, nor Seagrams, are interested in diluting their current level of control, which may be required in a deal that big. I think, on the entertainment side, Diller leans more toward gathering in MGM and may still be eyeing a major (non-cable) network. On the internet side, SEEK may present some opportunities, but that may likely start the kind of battle that harms both parties involved.
I do think that something is brewing today, though (pure speculation on my part). Keep your ears to the ground.