The commissioner shares your concern, and a draft of that letter is on my desk right now, so you will be receiving it shortly.
The difference between the example you gave about the video store collecting a driver's licence, of course, and a real estate agent scanning or copying a driver's licence is that the latter is required by law. So as you stated, under the Proceeds of Crime (Money Laundering) and Terrorist Financing Act there is a requirement to collect certain information.