Hi talesin,
Sorry, I did not make my point very clearly. I agree 100% that the content on the site can stimulate critical thinking and by coming here, even one that starts off as an apologist could change their opinion.
My understanding of the OP is that the site on it's own will not change opinion. Someone has to, at some point, be receptive to the information. It is not likely that someone who is still mentally in would hit on the site and have their opinion changed by browsing a few of the threads. Sure, lurking and continued access will increase the chance of a change of mind but if someone is lurking then they are likely already questioning things and looking for answers.
None of this minimises the fact that this site has been instrumental in helping many. many ones along their journey away from the WTS.