If you read between the lines, that article also said something else. (at least I think so) It said that Bowden wasn't prepared to trade any of what he considered his big guns (Vidro, Johnson or Wilkerson). That means, he's really only willing to give up prospects or mostly prospects in any deal. Well, all the teams who have the pitching (or whatever) the Nats need want players who can help them now.
After reading that article, I stopped holding my breathe waiting for another trade, because apparently Bowden doesn't have the balls to pull off a big move.