I don't think humans would ever have had the opportunity to evolve to the point we are at now. Our existence would probably be extremely short lived. I think even with the resources and scientific awareness we possess now it would be a struggle to excel as the dominant species just due to the sheer number and rate that insects reproduce at. I don't think we would be able to find a way to co-exist with insects in the way that we do with wildlife now. We'd probably end up killing ourselves and most of the ecosystem trying to find ways to control, destroy or co-exist with the insects.