A new government department is a necessity every few generations in a "meritocratic" bureaucracy. After a few generations, a governmental department simply gets too clogged up by career place holders to get much of anything done. That's why there is a national security advisor, which duplicates the job of State Department, a communications director duplicating the spokesperson, etc.etc.; CIA and FBI having been in existence for about half a century now, it's simply politically more convenient to organize a new department instead of going through a mass firing of both departments in the aftermath of 9-11.
It's not a new phenomenom. British Empire went all the way to MI6 (with five different instantiations before it) before the empire collapsed. Ancient Persians, Egyptians, Romans and Chinese all had similar experience with massive government super-structure, in the past few thousands years. No reason to expect change.
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