Yes, I think that anyone checking out this site would be affected. It should be mandatory reading BEFORE anyone is approved for baptism.
And many not even influenced by this site would readily walk away from the bOrg, but are stopped with the old: "Where would we go away too?" "I couldn't leave my friends." "My family would be so terribly hurt by my leaving." "But the world is so terribly awful, this must be the time of the end, even if the JWs aren't right about everything else."