Earlier quoted context omitted.
Countries that have that capability can't shoot down 40000 of them.
If this becomes a thing, they will put a laser on a satellite and call it a day. All of the big 3 (military, not economically, you know who I am talking about) can do this easily. edit: In response to below - they are putting SHORAD lasers on Strykers soon. Things have become a lot more compact.
Note that the response to star wars contributed to the Soviet Union's bankruptcy :).