This article brings up some interesting points and what I feel are some contradictions.   The purpose of redesigning the trails to be sustainable to the existing environment would be a benefit to this park.  If the existing trails are showing signs of use and damage from bikes then this can and should be fixed.   Evergreen's trail builders have a great history of redesigning space to fit the environment of the area and meeting the needs of all user groups.  Please engage in conversation with them openly as this sounds like an issue that can be resolved to everybody's benefit, including the benefit of this forest.   Also Duthie was designed specifically to be a mountain bike zone, it is a unique park with a different mission.  This clearly would not be the goal of this redesign.   I hope all user groups are able to enjoy this wilderness.