Unfortunately, it can hardly be considered that a 'mass exodus' has begun when they had a 3% worldwide publisher increase last service year.
Whatever credibility the WTS has been losing with all their scandals, etc, is being offset by developments on the world scene that making more and more JW's (and non-JW's) suppose that the GT is on the horizon after all. Economic recession, world food shortages, soaring petrol prices, terrorism, renewed threat of nuclear war, al quaeda, threat of horrible diseases, etc, etc. It almost does look like the riders of the apocalypse are about to ride forth (not since 1914). That's why we won't see any 'mass exodus' soon.