I posted some graphs at http://www.jehovahs-witness.com/12/121792/1.ashx that show there has been a significant drop in growth since 1995 and a large number of people leaving. I think this is partly attributed to the generation teaching.
I did not leave for 10 years after the generation teaching, but it was that change to made me realise I could not trust the Watchtower Society, and ultimately led me to read Studies in the Scriptures to find out how many teachings that had been changed over the years.
Speaking to my male friends before I left, many have little trust in the Watchtower Society. They stay because of "where else is better" but have no real urgency that the end is going to come any time soon. It is quite different that in the 1980s when we used to sit around certain the end was a couple of years away and without doubt going to be before 2000. It is the Urgency that has been affected more than anything else. Without urgency there is less growth.