Not at all. Do you think all their requirements to use that trail will keep people from suing?Do you think that waiver will really keep people from suing anyway? Nope.
I guarantee you that more people get injured or killed with on road driving than they do off road driving. No helmets required to drive to work yet.
Stupid people will do stupid things no matter where they are. It's nobodies job but their parents to protect them from themselves and the government is not my parent.