Agencies like the CIA (and the FBI) outgrow their usefulness when they have been around so long and succumb to political agendas from the bureaucracy.
Trump will do well pursuing the military intelligence route as our major source for intelligence.
For intelligence we have: military intel of all six branches (don’t forget Coast Guard and Space Force), CIA, DIA, intel assets of the Department of Energy (yes they exist wtf), Office of Naval Intelligence, Office of Geospatial Intelligence, National Reconnaissance Office...makes no sense.
While we’re at it, flatten federal law enforcement too. No more ATF, DEA, and Secret Service is purely tasked as VIP protection instead of counterfeiting and computer hacking (yes they investigate this). Roll the rest up into the FBI, and while you’re at it, fire all the crooks at the top.