Having elders and other pedophiles and molesters abuse the children seemed to work for quite a few decades.
The internet era no longer allows the above to work as well as in the past.
Hence, WTS marketers have adopted the McDonald's approach with Happy Meals and toys as the draw.
Whether this will reduce the churn rate of children remains to be seen, but I doubt it will make any difference.
As for Caleb and Sophia - Sophia did survive the Apocalypse, but did not fare that well in the long run.