NSA Chief Keith Alexander to Step Down

While this might seem promising in the surface, I don't see a change if leadership as an immediate indication that the agency is going to be overhauled.

I'd like to read Alexander's departure as a practical acknowledgement that the agency's work is likely to have to be conducted in the open from now on, and that new leadership is necessary to make that happen. However, it is just as likely that the man is leaving out of embarrassment over the fact that his lax security allowed Snowden's leaks to occur in the first place. Let's not forget, the leaks were a major blow to the operational integrity of the NSA. This is further backed up by timing of the departure: if he had left immediately after the leaks, at the height of the media coverage, it would have been seen as a result of embarrassment of the program.

Or, maybe he just left because he's been at the job for a while.