There is a show on National Geographic channel called 'When Aliens Attack'. Not only is there wild speculation but it also includes dramatically enacted scenes that show situation room type scenarios. It is horrible. It is so bad I squirm while watching. The situation room enactments are shot on crappy video with mediocre computer graphics.
The problem really is our plan for defense. There is really only one outcome. We would be wiped out. Does there really need to be a two hour show on that? No. No there does not.