Firstly there is no such thing as a private conversation when sterile cockpit rules apply. Compliance monitoring during safety critical tasks should be universal. Look what can be done in engineering to prevent maintenance error:
http://www.raes-hfg.com/reports/08de...e/comp-mon.ppt or capture terrible medical errors via video:
BBC News - Tetraplegic man's life support 'turned off by mistake'
I propose sampling, so perhaps one in 50 flights so that reduces the data to review but the nature of radom sampling means that the unprofessional behaviour NTSB have identified will be reduced as well as some pilots being identified for counceling.
I also propose analysing only those portions of a flight on a CVR recording where sterile cockpit rules apply. In other words a relatively small amount of data but at the most critical time.
Look at Google Earth & Steetmap. 10 years ago we would never have imagined we would have access to so much data.
Some responders may opine negatively here but the airline industry must strive to improve. Per Ardua ad Astra!