Mosquitos are pretty common in India and kills enough people, though roughly 8 times less than road accidents. Malaria is no longer very deadly but Dengue treatment indeed is pretty costly. Sometimes I feel that dengue cases are higher in cities than in villages.
Mosquitos are most active at dawn and dusk when people are usually out farming or just hanging out. Mosquito nets and mosquito repellent works well indoor.
Either you wipe out mosquitos species that cause malaria and dengue, or create vaccines and better drugs. Anything less than that is not going to be much effective. Personally I am against wiping out any species. The planet doesnt belong to us only.