An interesting idea. Harry Truman created the Central Intelligence Agency in order to consolidate the burgeoning covert foreign information gathering sources in the wake of ending WWII and dismantling the rather undisciplined OSS.
One wonders if Prez Truman forgot the natural organic destiny of bureaucracies to multiply and insulate themselves. There was already military intelligence (various) and diplomatic intelligence as well as FBI counterintelligence. There was no deep desire on anyone's part to consolidate sources or methods.
CIA's disastrous involvement in Cuba and the Bay of Pigs is an example of various threads beginning to unravel. JFK inherited the Bay of Pigs from his predecessor, Prez. Eisenhower; certain aspects of the previous plan disturbed him and he finally decided to alter a few directives.
That led to a disaster because both CIA and military intelligence were loosely coordinated and leadership was in question. Not necessarily as a result of this specific operation, but afterwards a more central command structure was sought and so it has ever been since. Now we have the DNI (Director of National Intelligence) appointed by the president, but we also have the National Security Council and the Presidential National Security Advisor.
Prior to the 9/11 attacks Jamie Gorelick, Deputy Attorney General of the United States, instituted a rule disallowing intelligence sharing between most covert operations agencies. The result of that bit of misguided direction should be apparent BUT she was assigned to the 9/11 Commission to investigate intelligence flaws leading up to the attacks so you can imagine the reported mistakes and what was not listed.
This is a bit of a disjointed history of the intelligence behemoth now choking our security efforts but it could beggar for dismantling the CIA; I suspect something would have to be assigned to replace it, and it would likely be staffed in part by all the unemployed spooks set adrift by terminating CIA. There may not be an easy solution to replacing the somewhat rogue CIA.
You are the brain (I mean in the small duo of “you and me”) and infinitely more knowledgeable, but my memory is telling me something about Trump being likely to dismantle the CIA and putting intel under one umbrella. Mil most likely. I know he has talked about the goal of merging and/or getting rid of some fed agencies, streamlining fed gov, with much fewer fed employees.
GOOD!!!