I think there is at least a better than 50% chance this won't blow over. There are too many bodies, a foreign government is pissed, and loose lips by amateurish agents being recorded are naming names and providing evidence for possible prosecution of members of the Obama Administration. An agent talking about having a PI dig up dirt on Senator Grassley is indeed an act of career suicide, and is going to raise some serious hackles. I can imagine Senator Grassley upon hearing of this conversation saying WTF!!!! Note to Senator Grassley and Congressmen Issa: Ask the nice agent if she has personal knowledge of Government employees digging up dirt of other politicians.
All of these people are safe for now, but in a few months, their lives may change drastically if a Republican is President and there is a Republican House and Senate. Some astonishing things are being leaked, and as another poster wrote, politicians don't like being disrespected by Federal employees. I think little miss McAllister will be appearing before Issa's committee soon. It will be worth watching.
On the other hand, the cynic in me whispers that CBS is pleading for Obama to clean house to save his presidency.