I felt the same way when I first joined the forum. I don't think what's happening could be accurately described as an exodus, more like a steady stream.
What I do think is significant, though, is the reasons people have been giving for showing up here in the past year or so. A lot of the folks that left a long time ago cite a lack of love or bully elders, etc as their reason for leaving. Before the only big doctrinal issues that seem to have woken up a good number were 607 and blood. There seems to have been a shift of late, though. People joining often cite a few common, org-wide, reasons for being here. It's the broadcasts and zone visits giving them a look at the true GB, it's overlapping generations, and ARC. These are no longer local issues waking people up, they're systemic. I think that will add up to a more consistent stream out of the org, and I think the people leaving for these reasons are more likely to research and wake up vs those that leave because a few elders wronged them and might be convinced to return.