Mosquitos are pollinators. And in some parts of the world that have extreme seasons that can't sustain bees, they seem rather important to the ecosystem.
Instead of eradicating them, genetically engineering away the numbing in their saliva that causes the allergic reaction in humans could be a solution.
I'll trade a couple weeks of itchy bites for a briefly painful bite any day.
Sure, humans would kill them instantly on feeling the bite, but most animals are not capable of that. Their populations would be fine.
