I don't know how many will leave per say, but I wonder how many kids will stop believing (eventually leave) because their parents watched the DVD and then forced them to throw out a bunch of prized/cherished possessions?
We make fun of the video but at least Caleb's mom was somewhat nice about it, all the born-ins know that is not reality. Most devout parents will guilt, browbeat, yell, lecture, scream, discipline and/or physically beat their children for doing what Caleb did, and if the child doesn't respond they'll take matters in their own hands and just toss the kid's stuff out without permission.
This video is going to do a fine job of turning children away from the borganization; what a fine witness it is.