Do we really have to wait for a few more crashes.. not "miraculously" without loss of life like this one, but wiping out 150-odd people (another 320 or 737) or more than 300 people (7*7, A330... ) and maybe another hundred or so on the ground, before anything is done?
Removing one of the "clear and present dangers" in the form of bird "sanctuaries" within a couple of miles of LGA is fairly straightforward. Moving LGA, JFK and Newark, plus the New York metropolis, is not.
I take it you haven't met some of the animal rights and environmental protection activists here in the colonies.