I have mixed thoughts on this.
I think the internet could keep people from joining if they are smart enough to do their research before they get dunked.
It could help people to make their decision to leave - but these would be the people that already have doubts.
Then there are people like my inlaws. I was helping my mother in law with some computer problems and helping her find a site on the net that had various bible translations. She told me about stumbling across E-Watchmans site. At first she read he was a brother etc and was happy to find the site - then read he was df'd. She closed the site as fast as she could, she told me she was so scared she was shaking. She immediately prayed to Jehovah for forgiveness. She asked me over and over again if I thought she'd be forgiven for looking at that site - that's how brainwashed they have her - poor woman. I told her I'm sure a loving God would certainly forgive an honest simple mistake.
So, it will have an effect, but only on a certain group of people.
BB