I am no biologist, but my guess is that if mosquitoes were extinct, some spider species would too, birds would also be affected, and so on.
Are there any mosquitos that live entirely on blood?
https://en.wikipedia.org/wiki/Mosquito#Egg_development_and_b...
A layer further up, many birds include dragonflies in their diet. And a layer further down, fewer dragonflies means more of everything else they prey on, too.
Hope you are not too attached to any of the following crops, which would die off without bats: cacao, peaches, bananas, guava, mango, dates, and figs.
Fruit bats and mosquito-eating bats are different bats.
Sure, no life, means no disease, but that is not really sustainable, isn't it?