Not to sound overly optimistic, but I can imagine that a trend like this is less difficult to reverse than, say, climate change.

The scientific consensus about climate change seems to be that even if we can muster the political courage and will and do our darndest, we may already have passed the tipping point and will boil anyway.

As to the insect apocalypse: given a fighting chance, life has a way of veering back. This is of course if viable numbers of populations survive and keystone populations have not been extinguished. (Maybe this is just a complicated way of stating that ecological systems work on other timescales than the climate.)