There are various theories about how insects are drawn to light bulbs because of navigation mechanisms based on the sun and moon's position in the sky. It makes sense for that to work when the only major light source on Earth was high in the sky at a very slowly changing angle, but now that we have artificial lights it seems like that would severely interfere with the regular life cycle of insects. Being stuck buzzing around a light bulb for almost half of every day seems like it could be damaging to the life expectancy of each bug, and therefore damaging to the species as a whole.
But the reality is, most of the "livable" surface on Earth is not covered in cities, so most of the bugs aren't affected by these artificial lights.
So that leaves me wondering, if we expanded our cities to cover most of the earth livable surface, would we potentially kill off a large portion of the bugs on earth that are drawn to light or rely on bugs drawn to light as a food source?
That's sort of a hard question to answer though, because of so many factors, however I think the root of the question is a simpler one:
Do artificial light sources cause enough fatalities in light-attracted species to prevent them from successfully reproducing at the necessary rate for survival? (assuming the whole species were subjected to such light sources)