If you look into it a bit, you'll find that the article title I assume you are reacting to isn't quite right. They are targeting a very tiny slice of mosquito species that both bite humans and carry malaria. The scientists involved (who are world-class in this field) have run the numbers on the effects of eliminating these species. This isn't childsplay, and at risk are millions of human lives. Mosquitos reproduce very quickly and if these species are removed then another will easily take their places. This is not like someone deleting all files of a certain extension in an OS directory to just see what happens, this is careful and researched biotechnology being put to use to end suffering.
>> The scientists involved (who are world-class in this field) have run the numbers on the effects of eliminating these species.
FTA: "It’s unclear what would happen if the world’s disease-causing mosquitoes were done away with. The ecological role that mosquitoes play hasn’t been thoroughly studied, though some scientists suggest we might be just fine without them.”
At least as reported in this article there seems to be a lot more doubt about what could/would happen than you suggest.