Two things:
1) I only ever heard their sack stat most of the year, so I assumed they were decent but not great. Maybe they do need a new DC? That's ... really bad for the second best team in the conference. Hopefully this means they don't do what happened to RGIII and currently Wilson, and get him some good OL and better defense.
2) I think part of what's going on this year has to do a lot with the favorable rule changes to offense. So I'm not an alarmist on these things. I still think that's a bit rash to sack the DC ...