I think the competition between the intelligence agencies is a good thing.
Competition is the apparent cause of our current problems. Even now, they want to leave the FBI CI and CT units under FBI control.
We need "all source" control and coordination, otherwise we will be unable to connect the dots quickly enough to do the job. In other words, all resources currently directed against the WOT must be under one roof. Big challenge, big responsibility.
It wasn't competition that caused the problems. It was the legal impediments to data sharing.
I think reorganizing the defense apparatus into a single chain of command runs the risk of even more massive mistakes of the kind we suffered in 2001-2003.
The military needs to have its own intelligence subject to its commanders, and the director of intelligence can facilitate the coordination of ops and information sharing between the agencies.
A competitive culture that leads to extensive multiple intel networks throughout the world, with various emphasis based on the culture and philosophy of the agency running it, stands to be the most flexible and reliable for gathering and cross checking intel.
The director can have and run a combined Intelligence Command Center, where analysts from every agency are based, and which coordinates threat watches, and prioritization.
I just really hate the idea of a powerful Intelligence Directorate operating domestically with the power of the FBI for law enforcement. Gestapo keeps on popping into my head.