I don't think there's a snowball's chance in Hades that DOJ is going to fully comply with the subpoena. They'll claim it will endanger ongoing criminal cases and investigations and endanger national security. DOJ will say they are complying but then won't. They'll try to turn it into an attack on Issa, et al.
Jim's Rules of Carry: 1. Any gun is better than no gun. 2. A gun that is reliable is better than a gun that is not. 3. A hole in the right place is better than a hole in the wrong place. 4. A bigger hole is a better hole.
no guns = might makes right