The end game of government is all dark-room. Bills are written in secret by lobbying groups, treaties are negotiated and signed in secret, the TSA can arrest people through secret laws, more and more government lawsuits are in secret, we can withhold prisoners indefinitely in secret, the fact that a secret organization contacted you and demanded secret information is secret.

This isn't just TLAs, it's the entirety of government. Some bits and pieces are farther along than others, but it's all heading that way (same with local governments).

Edit: did I mention starting/conducting wars through secret re-interpretations of existing laws?

Edit 2: did I mention you can be prosecuted with secret evidence you and your lawyer aren't allowed to see?