All of our best data on the impact says that it really wouldn’t matter. Sometimes a species is a linchpin for the ecosystem, and sometimes it isn’t.
Sucks for mosquitoes, but there’s a very real chance that we’ll smallpox them, and the biggest concern will be our confidence that the virus we use doesn’t impact other species unintentionally.
Most modern plans for eradication involve creating a virus that handles it, rather than a pesticide.
Have the virus introduce a gene that takes a few generations of breeding in the impacted population before it starts to debilitate or sterilize the mosquitoes. That way your virus can start to kill the population even as it spreads to areas that were missed.