Ski resorts have fatalities all the time and the remain open.
Mt. Creek bike park lives up to it's legacy of Traction Park with it's always crowded first-aid station.
I think most people understand there is risk involved in certain sports. The only time these parks are held liable is when there is faulty infrastructure.
The biggest threat to 6MR being closed is an accident due to faulty infrastructure or trail design/maintenance.
If one of those wooden bridges collapsed and a rider got hurt that could be a media firestorm.
If a hiker got injured by a MTBer speeding around a corner, that would also be a terrible scenario that would have me worried.
Hopefully everyone stays safe while riding and this is all just a moot point!