This recent slump could very well be a sign of things to come in 2010. Not that the Nats will be terrible offensively. But when they aren't getting base hits, the Nats won't be scoring runs. Outside of Zimmerman and a healthy Willingham, the Nats won't necessarily have patience or power in this line-up.
Let's ignore Nyjer for a second (as he should be in a discussion of patience and power). Here are the minor league stats for Ramos, Bernadina and Desmond. Note that an isoOBP of .070 and an isoSLG of .155 would be about average in the majors.
Ramos isoOBP: .047 isoSLG: .146
Bernadina isoOBP: .085 isoSLG: .120
Desmond isoOBP: .067 isoSLG: .129
Right away the lack of power should grab you. This is something that can develop as the body fills out, etc. However Bernadina is probably as developed as he can be and neither Ramos or Desmond project to be big sluggers. (For contrast Dunn has a .221 isoSLG in the minors, Zimmerman a .224, Willingham a .234) I do like what I've seen from Desmond this season (a .154 isoSLG) but I don't think he'll ever be a 30 homer guy, maybe not even a 20+ homer guy.
As for patience, Bernadina has some but Desmond does not and Ramos is a hacking machine. I kind of like patience developing for a hitter like Ramos (and Bernadina). When you hit for high average in the minors there's not much need to take pitches. But how much patience? I'm not sure.
In the end you see a little patience here, a little power there, but really it's a bunch of Singley Joes. That's not a terrible thing - Ramos could very well hit over .300. Bernadina in the .280s - but it's a tough way to score a lot of runs.
There is some hope for an all around player to develop though. Here is the numbers for Espinosa
Espinosa isoOBP: .095 isoSLG: .185
These are both good numbers and with a little bump in the power numbers - Danny might become a legitimate power threat.
This highlights what the Nats will lose from the lineup if Dunn is let go. His isoOBP in the majors is a fantastic .130, his isoSLG in majors is an even better .271. Even if Dunn isn't hitting, he still usually is getting on base and when he does connect he'll be hitting homers. He's still producing. A lot of the Nats lineup doesn't have those talents and when they go through batting slumps like they are now, they'll be providing next to nothing in terms of run scoring.