Erradicating a mosquito species could have negative ecological consequences unknown now, and on top of that, there’s the risk of another vector taking the mosquito’s place.
I fully agree with you that something has to be done about these diseases. Going back to your first post I replied to: my mother had Polio and lived with minor side effects all her life, while thanks to vaccines, that disease is something from history books for myself and my children.
I am just concerned that people tend to ignore the risks from things we don’t know exist and therefore don’t usually account for.
But yes, the law of unintended consequences will probably apply.
But it's worth keeping in mind that Malaria kills one child every 30 seconds.