RJ,
Once world class athletes like Jordan, Marino, Elway, along with the myriad of baseball and hockey players began playing golf and announcing their love for the game, it elevated golf from a "sissy" sport to a popular sport.
Starting in the 50's and 60's parents began touting alternative sports, soccer being the most prominent.
Then, lacrosse began to become popular.
Remember, in the 60's, Nick Buoniconti, an All American linebacker and guard at Notre Dame, played at 205 to 215.
Today, he couldn't make a high school team from a size standpoint.
From the 60's to current date, players became bigger and faster and more athletic.
In addition, conditioning programs other than pure weight training began to gain momentum.
All of this resulted in speeding up the game with bigger, stronger athletes.
This in turn resulted in more injuries, not nicks and bruises injuries, but injuries with lifestyle altering affects.
And some parents began to see this emerging pattern which resulted in redirecting their kids sports pursuits.
At the same time kids were discovering alternatives to football that might not have had the glory associated with playing football, but, with ascending recognition and reward.
There's a reason that good to great basketball players come from the inner city and why good to great football players come from other than well to do, well educated families. Contact sports has always been the highway leading from poverty/middle class to riches for the less than wealthy. The problem is the price paid by those who don't achieve the ultimate success in their sport. And, more and more parents are realizing that the risk is not worth the rare reward.
The "Olympic" spirit, dating back thousands of years, almost deified the best amateur athletes.
Commercialism has deified the "professional" athlete, at every level, and left the amateur athletes on the back pages, if that.