I believe the airline corporations will fight this as well. I can only imagine the litigators salivating over this information for suits against the airline for anything from ground delays to inflight medical emergencies and EVERYTHING in between.
I used to be a locomotive engineer and the rail roads fought off the notion of voice recorders simply to help them hide from liability in accident investigations.
I can hear it now " the pic neglected to call ramp control to get a gate so I could take a dump"