I mean, we eliminated smallpox viruses, and the impact was that humans no longer die from smallpox. We have almost eliminated polio, which has the impact that nobody needs an iron lung any more. We have massively reduced the incidence of a whole range of other pathogens. Are you concerned about that, too?

I'd be much more concerned about the changes humans do to our ecosystems that we know cause harm, but aren't stopping (like filling the atmosphere with CO2 and other greenhouse gases) than about changes that would, almost certainly, reduce harm and have only extremely unlikely and hypothetical risks.

We have a lot of experience in what happens when mosquito species are removed!

Mostly because the rich world eradicated a lot of them to stop malaria.

Of course, once we were safe we told the rest of the world they had to live (and die) with with malaria, because we had discovered environmentalism.

Basically 0, there are only a few species of mosquito that carry disease. Other species fulfill all other ecological roles without spreading horrible diseases.

few people know that mosquitoes are also pollinators for some plants

From memory, mosquitos are a food source for some birds and bats, pollinate some plants, and, most uniquely, help drive wild cattle migration (to keep them from overgrazing areas into barren mud-fields).

we are already wiping out many species, wiping out one that's basically always bad both for humans and other animals is probably net positive

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