The scientists in the article assign low probability to that outcome. While species in the ecosystem are interconnected, but the degree of those connections varies greatly. Other species can fill most of the niches occupied by mosquitos, and they'll likely carry fewer diseases.

You seem to be arguing from ignorance and advocating caution. I'd usually agree, but right now millions of people are dying and suffering because of mosquitos. With decisions this important, you can't just play the "what if?" card; you have to make the best choice after looking at the available evidence.