Many insects we need, as you said, are in grave danger. Hearty insects that thrive with us will be high in numbers. Ie, pine beetles. In HI, there are too many fire ants and coffee beetles, hiking the price of your coffee.

However, never think it is too late to have human beings replace oil guzzling lawns with pollinator gardens. Or to stop insecticides.

Even it it were too late, we should go down with a bee better buzz, not a whimper, covered in flies.