However, I doubt that the DOJ is going to use any prospective registry to prosecute-or deport-convicted criminals and/or potential terrorists.
You are missing the point. I've thought this through and the President is correct. People that have come here and worked for years doing jobs YOU won't do should not be punished. I know the word "amnesty" upsets some people, but a guest worker program is the next best thing. These poor people need our help not our abuse.