I think they researched this and found that literally no creature completely rely on mosquitos, and that if they were wiped out the power vaccum would be replaced by other small flying insects that are within the diets of the creatures that would otherwise eat mosquitoes. So yeah, there really isn't anything stopping us from wiping them out. I say do it, and just keep some in a lab just in case if fucks stuff up. Or maybe more reasonably just modify them so they can't suck human blood or pierce human skin, which I'm pretty sure we're also already capable of.