I'm afraid history has shown us that nothing can cause such a reaction among JWs. Really big things (1975, the Rutherford power struggle) have happened in the past and they did not cause a mass exodus or anything like that.
Except all those things happened before the advent of the internet. A proper scandal (not like the UN thing which is a bit of a non-issue IMO) in the nternet era could have serious repercussions for the society. Things no longer occur in a vacuum.