Earlier quoted context omitted.
Look at this problem from different angle. These two species are only abundant in areas where humans live. The malaria annual death toll is about 440000 lives. Maybe it is more worth of an effort to move humans out of there? Since no one is going to eradicate cars worldwide just because the annual human death toll in car accidents is 1.25 million!
Let me know when you find a place that will accept and support 180MM Bangladeshis and 1B Africans. Kill the mosquitos. It's cheaper in the long run.
Is it? A human that survives to reproduce that would have otherwise died from malaria uses more non-renewable resources than a human that dies from malaria over the course of their lifetime, and continues to do so after their death by way of their progeny.
In terms of how much time we have as a species before running out of non-renewables on earth, killing the mosquitos might cost more than our blue marble can afford.
Perhaps certain natural population controls ought not be tampered with.