Won't happen (though that video creeped me out for a minute, like a horror movie does).
It's like the guy in Ghostbusters 2 who wrote about the end of the world in 1990. He wrote the book, and sent it to be published, but there wasn't enough time between the manufacturing of the book until his predicted date. Of course, the world WOULD have ended on that date if it weren't for the Ghostbusters.
So, what I'm saying is, Ghostbusters III starts shooting December 21, 2012