It's sad that you are being downvoted. This is a legitimate question especially considering the history of science and just history in general.

We used to wipe out all kinds of animals that were deemed pests only to find out later on that these animals served a role in an ecosystem.

I personally do not mosquitoes and wouldn't mind if they weren't around. But I hope we are absolutely sure that we know what we are doing and don't regret wiping out these mosquitoes a century later. Hopefully there aren't any unintended consequences.

Don't birds and other insects eat mosquitoes?