Pretty sure the current proposal will already require scanning everything.

To stop the “production” you would need real time scanning of the camera when taking pictures and video and disable the ability to save if csam is detected.

Saving and sharing would still function, albeit in a slight different way.

  - Saving, as before.
  - Sharing, works, but due to a glitch the recipient got a blank blank image/video. He'll sure reply to let you know, but unfortunately incriminate himself in the process.
  - Deleting, as before, no sorry, bugger, I/O error, can't delete this file. But support team has your address and is on their way.