I can see why. Its legally and ethically problematic.
Young kids sign up at 18 thinking and hoping they'll make it big, spend a few years going hard but never make it, do significant damage, then hit 35 and think WTF was I thinking?
The premise kind-of works for players who make it and make a lot of money, but most don't.
If society standards continue to progress, safety, human rights etc, I think footy will fade away, like bullfighting and smoking in the pub. But progress isn't guaranteed of course. We might be back to full Balmey piledrivers, Leigh Matthews on Stan Magro, durries wherever you like and cockfighting in the local pub in a few years, who knows.