There's little doubt that pesticides are taking their toll, but habitat destruction is every bit as bad.
At least you can stop using pesticides, altough, as usual, the chemical industry is excellent at getting government to sell out the environment and cheaply.
The problem with habitat destruction is it's very difficult to undo. What do you do about recovering fields when there's now a subdivision there ?
One way is to educate people to make their yards insect friendly, starting with not using pesticides, and to try and make it habitat.
Gardens, and I mean food gardens, seem to be excellent habitat. I see bugs that I've never seen before hanging around when tomatoes or brocollini or some other plant in the garden is blooming.