Your response is typical trolling - a mass extinction would be a far higher proportion of fatalities in which case most people would simply stop using forums.
You asked this question:
"Can we please have a sensible discussion of this issue and any solutions to identifying UID's that fall silent during this period and are potentially hacked/brought back to life later?"
Why would you want to catalog these UIDs that "fall silent" during this period? Why wouldn't we approach the issue as we already do?