I should weigh in on the debate here with some actual facts and stats.
The SASI group that I toured with in 1998, I think had about 20 boys and girls who had all basically completed Year 12 that year.
Of that group Oscar, Jacob, Daniel Cioffi, Darren Ng in the boys (and Caroline Nixon plus maybe others, sorry my recollection is worse than Mark Vaile at times!) are either making a living or have made a living from the sport. Katrina Lindner and Leah Cannon have/will get 4 year degrees at US College (and probably more that I can't remember).
What was remarkable was that while we were in Europe they got their Year 12 results and had some idea of their university placements as a result. An incredibly high percentage were going to uni the following year (around 80% from memory). There weren't many who were not! Those that weren't had a trade or an apprenticeship lined up. I can only think of 1 player who had a problem. (I know because we all gave him stick, saying he was going to be a homeless bag lady, jokingly of course!).
Now I know that was probably a good year, but it illustrates the point that most people who are posting on this topic with any experience are making. Yes, it's hard and not enjoyable at times, but it is worthwhile and even if they all don't "make it" the skills they learn will help them be better students, athletes, workers, mothers, fathers etc in the future.
If you compare the kids doing high level sport programs (any sport not just basketball) with the average student, they generally do better in their academics and their future vocation and lives because of being in these high level programs. They need to work hard, be organised, able to cope with adversity etc or else they just aren't able to do it.
The ITC (SASI in SA) program nationally takes a holistic (yes I know, buzzword here!) approach to the person's development. Goal setting and progress are measured on and off the court. The diary is the central tool used by the athlete and coach to help the athlete through the year. It is very detailed and is checked regularly by the coaches and guidance is given to help athlete's cope with the workload. Most cope very well, some don't. But most are better in the future, whether they "make it" or not for having done it. When I was a head ITC coach, the majority of my time was not spent on-court. The largest chunk of my time was spent helping with the non-basketball side of the athlete's lives.
From a club point of view, many (if not all) clubs help manage the workload for players very well. They counsel the player to get a manageable workload through the year. My club ceratinly does. An example is that many of our players involved in State in the past have not done any club training for a month prior and post nationals. Not many have been involved in seniors until Year 12 is over. Those that have been have been carefully monitored.
There are many people posting here expressing their opinion, which is fine, it's a free country. But some of the opinions are misinformed. I hope this post is informative and corrects some of the misconceptions.
To summarize, most athlete's involved in high-level programs ARE better off in their future lives, regardless of whether or not they end up as full-time professional sports people. This fact is indisputable.