The USBC needs a program that encourages youth bowlers to move into adult leagues.
I am really not sure this is the job of the USBC. People who want to bowl will continue to bowl. People who stop bowling once they are out of junior leagues and school programs most likely never really had their heart in it.
We have a substantial junior scholarship bowling program in my area, and some of the kids go to Junior Gold, go to colleges that offer bowling programs, etc. Those kids tend to stay bowlers once they graduate.
Other kids only do it because the parents push them to do it and pay for it, they *might* get some small scholarship fund out of it, and it is something to do on a Saturday morning. However a large majority of them aren't really in to it, and quit once they are out of the league.
Unfortunately, kids these days are programmed to ask "what is in it for me" when it comes to participating in things. When they ask the USBC "What is in it for me to keep bowling on adult leagues?", and the USBC has no answer other than "fun and camaraderie", the young bowlers will say "ok...I'm out! see ya!"
Honestly, the USBC doesn't offer any incentives or enticement to bowl on adult leagues. It boils down to a desire of the actual bowler to want to devote the time and expense to participate for their own personal satisfaction and sense of accomplishment. When that feeling [or the time and available money] goes away is when most die-hard bowlers walk away from the sport.