Wow! Learned something new today. I've been misinformed into believe that mosquitoes are useless, and we should wipe them out.
I'm all for eradicating the diseases, but not really a fan of wiping out entire mosquito species. Eliminating biting mosquitos may have a knock-on effect... possible unforeseen effects that may adversely affect entire ecosystems.
There may be certain species that have evolved to hunt/feed on specific mosquitos, and in turn, other species that rely on these. When they are displaced because of this, it's possible that the checks and constraints on certain species will be reduced.
They may not be efficient pollinators per insect, but they may yet pollinate certain types of plants in certain locations that no other species do efficiently due to sheer numbers.