Logic is sound, but my data was a bit flawed in that I misread the article (was too quick) and used the 2014 data instead of the 2017 team. There are 3 points to be made.
- There is a difference between turning pro (17 or 18) and peaking in athletic performance (age 25-27).
- What is the average age that National Team athletes are at their peak and did the Coach (Arenas) exercise good judgment in selecting the squad.
- How many USSDA athletes turn pro before aging out at 19.
But first, let's back up and correct my mistake in stating the data. According to this article:
https://content.iospress.com/articles/journal-of-sports-analytics/jsa0021 the median age of the Trinidad USMNT was 29 (not 27). The 2014 squad's median age was 27. In addition, according to this article, Coach Bruce Arenas elected to start only 4 players under the age of 25 (
https://www.nytimes.com/2017/10/12/sports/soccer/usmnt-world-cup-landon-donovan.html)
Because nearly 1/2 of the squad was over the age of 30 and over half were over the age of 27, the USSDA had no impact as it didn't exist and for the balance of the players there was only marginal influence of their development given the starting 11's age. Logically speaking we can conclude that the USSDA had insignificant direct impact on the players chosen to start for the USMNT and the performance of that team had very little "direct" influence.
Your point, however, is the lack of young players chosen for the team is "indirect" evidence of the ineffectiveness of the USSDA. To analyze this point we need to look at a few factors:
1)
Bias in choosing players for the USMNT by Arenas. Let's ignore this one and just assume that Arenas picked the best players, despite charges he didn't and went with players he knew.
2)
What is the peak performance age for professional players. The prevailing thought is that professional soccer players reach their peak performance between the ages of 25-27. Indeed, the average of most World Cup teams is 27.5 (see,
http://www.bbc.com/news/magazine-28254123, and
https://content.iospress.com/articles/journal-of-sports-analytics/jsa0021 [25-27])
Based on the two referenced articles and statistical analysis presented therein; a successful World Cup team should have players with an average age of 27.5. This means that
nearly 7-9 years will pass between when a player graduates from the USSDA and reaches their "peak performance" at 25-27 years of age. Remember, players age out of the USSDA at 18.
We come to the final question/point. Is the USSDA capable of producing "elite" players that are capable of turning pro at age 17/18, and if so, is the system capable of taking in those players domestically and furthering their training so they reach "peak performance" at age 25-27?
I believe the answer is yes (system can produce 16 year old phenoms ... Lederman, Pulisic is an example) and no its not capable of developing those players further.
US phenoms are stuck in a catch-22. The level of play in the USSDA is high enough for these players to get on the radar of foreign youth academies, but because of Article 19 (FIFA), they can't move to those clubs until they reach 18 (see,
https://www.nytimes.com/2015/09/01/...ifa-rules-sidelines-young-players-abroad.html).
Once players age out of the USSDA they are faced with the choice of choosing college (death sentence for development at the mens level) or going pro to play on an MLS "B" team. The vast majority of European academies that wanted those players wanted them at 14-15, not 19, so that option is out. Once a USSDA player chooses college they basically become unavailable because their development is stunted due to the NCAA's training restrictions. So now the only hope for high level training and development is the MLS programs, which is subpar compared to their European counterparts for a variety of reasons (namely athletes in program are not elite).
Ultimately, this brings us to the Million Dollar question, can we blame the USSDA for not producing 25-27 year old soccer phenoms that will make an impact on the USMNT?
I believe the answer is no primarily due to the fact that those 17/18 year old elite players can only become world class players by training and playing at levels not offered domestically at the present time. It therefore follows that because USSDA players age out at 18 and won't reach their peak performance until 25-27, the failure of the USMNT is directly due to the failure of our domestic senior programs (MLS, NASL and USL) to (1) entice and/or (2) train players in order to further their development instead of going to college where it will regress.