Internet or not, as long as you have people that are lonely misfits, have suffered unexplainable tragedy, or are just plain nuts, there will always be a certain segment of the population that will fall prey to the Organization.
That being said, aside from born ins, the loss of intelligent, informed people will take it's toll on the religion. You can't sustain an organization with only needy people.
If anything, the internet serves a purpose of allowing the curious to instantly confirm whether a doctrinal statement is defensible.
That alone will eventually thin the ranks, until the Organization is comprised of only born ins, the dysfunctional, and those in third world countries with no access to the information that will allow an informed decision.
Of course, that's just my opinion.