Here is a snippet from an e-mail thread I received back around March of 2015:
In terms of the overall participation rates, below is some statistical history which may help put things in to perspective. While the total USAWS member is declining along with AWSA Sport Division membership, participation at the AWSA US Nationals is actually declining at a much slower rate. In fact, by percentage of AWSA membership, participation actually INCREASING. For reference, the Ranking List appeared in 2007 prior to that the Rating System (EP’s) was used to determine Nationals qualification (along with placements).
....... Total
....... USAWS AWSA % AWSA to Nationals % of AWSA
Year Members Members Total Member Skiers Members @ Nationals
2005 23539 12418 52.76% 845 6.80%
2006 23193 11886 51.25% 756 6.36%
2007 22521 11306 50.20% 668 5.91%
2008 21179 10446 49.32% 793 7.59%
2009 17572 9016 51.31% 729 8.09%
2010 18083 8988 49.70% 740 8.23%
2011 17445 8611 49.36% 655 7.61%
2012 17580 8408 47.83% 654 7.78%
2013 16285 7675 47.13% 661 8.61%
2014 15763 7208 45.73% 621 8.62%
So with the previous numbers from @Klindy it is shown that of the target pool, AWSA members, participation at Nationals is up and rides per skier is up.
I infer from this that Nationals as it is successfully serves AWSA members, that it is not necessarily "broken". Room for improvement, sure.
EDIT: the table reads
Year, Total USAWS Members, AWSA Members, % AWSA to Total Member, Nationals Skiers, % of AWSA Members @ Nationals
I couldn't seem to get the table to retain format. ???