Government agencies react like this, not cause its genius, or a masterstroke backup plan, its cause turning everything off is the only way they are sure its stopped. Its like you finding out you have a virus and pulling the internet cable our of your machine, then having countless committee meetings and status reports on where everyone is at finding the virus and updates on when the cable can be plugged back in.
Yeah it works, though its the sledgehammer approach. That approach does not work for companies providing a live service to its customers. Turning off a service is a last resort and not a plan. Right now there are some very high executives blowing thier top, and demanding explanations on how this has happened, and why the service is still down. You might think this is controlled, the reality is that is very very chaotic right now, and heads might role over this.
If Apple did infact have a contingency plan for this, the service would have been restored in a very short period, which would have looked like routine maintenance.
The bottom line is, the hack exposed a serious security flaw, and the service will not resume until its been patched, and tested.