The article doesn't address that not all new trails are wanted by everyone. Specifically, super dense network of singletracks put in by mountain bikers put in many parts of the country in recent years. I mountain bike sometimes as well as run on those singletrack trails after they are put in because they are there and it's too late to complain at that point, but they need to show some restraint sometimes. A really dense network of singletrack trails can change the feel of an area from a batural area to a more sterile bike park.
In my town, a lot of the new trails are officially sanctioned, but there are still a ton of illegally built mountain bike trails. As someone who used to be on the board of the local orienteering club, I'd put in comments to local park commissions that we needed to limit new trails on the prime orienteering areas to keep the experience good.
That was listened to, but illegal trails just pop up anyway.
For the record, my town doesn't have the resources to keep up with care of all the trails. The bike groups maintain the ones they develop, and the ski club a lot of the rest. But it's individuals like me that clear the wind downed branches and trees on the other smaller trails. I carry a folding Silky saw sometimes after windstorms for that, especially for the ones out my back yard, and no one is counting that.