The National Security Act of 1947 was written at the beginning of the Cold War -- a different century, a different conflict, a different level of technology.
The National Security Agency has been allowed in the twenty-first century to operate in complete secrecy, preventing even a general debate among the American people about the trade off they want between security and civil liberties.
The NSA now operates as a Leviathan bureaucracy. No more. Abolish it, and stop preventing the American people from debating whether a national security state is even necessary. Whatever we decide, we will then work to implement.