Sterile cockpit is overrated as a safety issue. I did not notice any change in pilot awareness when the sterile cockpit rule went into effect if observed. Elizabeth Dole's random drug tests probably accomplished the same results. Zero. The NTSB will probably blame the non sterile cockpit as a reason for the crash because it is easy to prove they did it and it was against FAA regulations. I had a bomb threat once and did everything per procedure and evacuated the aircraft but made sure my taxi time back to the gate after the evacuation erased the conversation before we were advised because of the sterile cockpit rule and I couldn't remember if we were talking about anything not related to safety of flight below 10,000 ft.
Eventually you'll get caught up to just like the Delta 727 crew at DFW with discussing erasing the CVR but never have the chance in the big one.