Luckily for us Arizona has done this. As our sport grows and as the public perception of it improves, we can hope for a situation like that of skiing. Several years ago a skier sued an area in Vermont because he said their perfectly groomed slopes weren't really perfect, which was why he lost control, crashed, and crippled himself. Never mind that he was skiing way too fast for his ability. Anyway, the ski industry realized they would all be out of business without legislative help.
Skiing is a major segment of the economy in states like Vermont and Colorado.
Those and other states all passed laws within a couple years of that suit, making skiers responsible for themselves. Check out the back of your next lift ticket. It reads just like a skydiving waiver. I will E-mail or send a regular copy. USPA also has an informative publication for dzs on waivers.