I have yet to study if these pests have any benefit, so I can only speak from experience.  I dislike them intensely.  Since you mentioned a possible solution, I checked to see how well it could do in terms of simplicity, effectiveness, and efficiency.  From what I could tell, it would require an impractical[0,1,2] approach; and since I live among mosquitoes, I need to guard against illnesses like these.<p>0: overly-complex · genetic re-engineering of a wild species<p>1: ineffective · look at other attempts to control Nature through domination (usually, they backfire)<p>2: inefficient · I can barely imagine a technology we could manufacture that could do this simultaneoulsy in every affected area where humans and mosquitos live... even then, see again my point on ineffective