"We have to move the issue beyond out respective passions," Haugland says. "Our feeling is that the data (from elsewhere) don't conform to the needs here in the eastern forest. We see the evidence of (bike) impacts, but it has not been studied scientifically."
This is a quote from the link I am about to post. ^^^
There is nothing really to gain by arguing and blame. I personally believe that it has less to do with use, but with trail design. If you really want to make a difference, fix the trails. There are many groups that do this, check out wvmba for example. I really want more people to be active. I live and work in what is possibly the epicenter of bad health. The National Park Service's solution to trail erosion, is to shut them down, and limit access.
There is more benefit for cyclists, backcountry skiers, equestrians, hikers, hunters, and others to join together, and keep the trails open. I wish that WV were more active in this respect. There are perhaps thousands of miles of trails in my area. Old logging and mine roads that could be used to maintain an active lifestyle. These areas are being bought by the NPS and turned into Wilderness areas. Anything that has, wheels, hoofs, or skis, is outlawed. These lands were deemed for public use. Who uses them? The conversion of these lands, has decreased useage.