The WTS sure has to do something for the kids! Growing up in this crazy world isn't easy. Kids don't need extra burdens. Your real youth doesn't last long, Wearing suits and ties a few times a week and boring door to door is so stifling. No extracurriculars, no organized sports,no dream for a stimulating profession if inclined.
Since it is the JW youth getting baptized for the most part (at least in first world countries) but most of them leaving when getting into adulthood, should cause a re-consideration. They 'burn out' their best resource. If the JW youth remain and bring in a "third generation," those parents(of 2nd generation), remembering their own youth, are often 'softer' and seem to try harder to make sure their kids have more opportunities of 'personal enrichments.' Who of them would want to impose possible DFs, JCs, marking, shunning on their 3rd/4th generation, when they had to grow up with such threats. But it will have to be the 'parents' to 'speak up' for their kids. The GB would have to be forced into it.
Doctrinally, I think JWs like it mostly the way it is,,the name Jehovah, no hellfire, most really like the Paradise hope,,I think most JWs would be content about 1914-1919 being adjusted that the Watchtower brought in a New World Enlightenment then, still could always believe the end coming at any time, just always be prepared no matter. (there are lots of religious groups that believe some sort of variation like that.)
One thing, since grandparents (first & second generations) have died, and longer and longer in "nothing" land, this is not very exciting. Maybe they (GB) should invent for these that had the Paradise hope and died , to actually be spiritually alive in a "holding" pattern place, a second heaven, a good 'limbo' (but not in presense of Jehovah, because the GB only have dibs on that spot). Make it exciting to JWs that these ones are in a way 'special' ministry schools and training, preparing with knowledge on how to direct (of course, still under the GB) the grand earthly resurrection schools/centers.
Cults water down, otherwise, at least slowly dry up.