Does that mean that projected times of death based on decomposition (As seen on the pseudo scientific scenes in CSI) could actually be drifting over time due to less decomposition agents?
Anyone that tells you a time of death beyond about 20 hours is lying. And the estimates below that are usually based on processes that haven't changed (loss of body heat, chemical changes in blood, and bacterial processes in the gut).
They are also the primary source of crop pollination. Without them much of our food won’t be pollinated and reproduce well.
We need them.