Most military planes have some type of protection, but nothing like in the video. As for commercial flying, there are many cameras, including IR cameras throughout the terminals and grounds that are constantly being watched for suspicious activity. The public can help also by being alert when in the terminal and also looking out the window of the aircraft, especially on takeoffs and landings for suspicious activity. Never be timid or afraid to report suspicious activity. You may save many lives.
I have read that Congress has taken up this issue, but as always, costs and who will pay are the issues. For the first time in decades, the airlines have turned profitable thanks to the many fees that the FTC have allowed them to charge.
Keep in mind the old saying, "The most dangerous part of flying is the drive to the airport."