People take the waiver wire way too seriously. Almost every player is put on the waiver wire. If a team offers something for Dejuses more than they gave up, maybe they let him go. Or he just stays as the 4th outfielder.
Temo, agree on depth for the most part. They have a lot of depth at certain positions (C, P), but some of the other spots they are weak at. This is directly correlated to having Bowden as a GM until 2009. You can build some top shelf prospects in a short amount of time, but in order to build depth in the organization, it takes years. They already have several really good prospects, but the depth has just started being established within the past 2 years once Roy Clark took the job and is in the lower minors. If you are the Nats, your core is Rendon/Desmond/Harper/Zimmerman/Ramos so build around them.
Agreed with 50 that the worst thing they could do is panic. They should just leave the rotation alone outside of a vet starter as insurance. Add a piece or 2 for position players/bench.
Outside of completely blowing it up (which I wouldn't expect), the spots they need to look at are CF and 1B. They have to figure out what to do with Span and Laroche.
I would consider Morales at first if I was them. I would probably keep Span.
Temo, the bullpen is essentially league average. They screwed up by not obtaining a more proved LOOGY or trying harder to re-sign Gonzalez or Gorzalany. That is an area they are def. going to have to look at as well as figuring out what to do with Soriano, who has turned into a train wreck the past week or 2. Thats an area they need depth in the organization in for sure.