You realize that he's making statements based on studies done by industry groups, right? And that he states his sources for the info? "(these being the National Ski & Snowboard Retailers Association Snowboarding and Skiing Participation report, the Kottke National End of Season Survey, the National Ski Areas Association National Demographic Survey, and others)?"
And if this is just something one guy is making up, I wonder why the National Ski Areas Association (one of the survey sources from above, and the LAST GROUP IN HISTORY THAT WOULD FIND POSITIVES IN DECLINING NUMBERS OF SKIERS), has a section of their website about GROWING THE SPORT, in which they state:
Just because you don't want it to be so does not change the facts. There is no question that the number of skiers is declining. This is temporarily bouyed by the fact that those in the sport are skiing more days, but that will quickly reverse once they aging population of skiers no longer has knees to do it.
Ski areas have what looks to be a huge bubble hanging on the horizon- think of all of the expansion plans currently in the pipeline, all of the millions spent to finance those plans, and try to figure out how it gets paid for with 40% less skiers in as early as 15 years.