And secondly, I contrast this with the vibrant, enthusiastic and informed young people in the various JW congregations in my area.
So, speaking from my own direct personal experience, I can only say that I do not see young people (in my area anyway) leaving the Watchtower. Not en masse, though of course some are, just as some adults are.
And I see the same thing in my socal area, there's no massive leaving. Youths are leaving, but it's here and there. Do you know why? It's because they act however they freaking want! Why leave if you can get tattoos, sleep around, drink like sailors, and smoke a little bud without getting in serious trouble? The young people have created their own JW-lite culture, a clique that they can call their own. I saw some of my old crew, recently. You can't tell them apart from non-JW kids, you really can't. And that's the great thing--when they look and act like everyone else, then they'll grow up to be mediocre, in-name-only JWs.
The org can keep growing, for all I care. The integrity of the next generation is poor at best.
I gotta give credit to the Mormons and other churches for creating programs to keep young people in. They're thinking about future growth. The Borg just wants an endless stream of rank and file to replace the fallen.