I have a thought for you.
The area in general has trails going ALL OVER THE PLACE, so no surprise that they are wanting it closed.
What I have seen work many times in Colorado is just going in there and defining the trail. Many of the "play" areas in Colorado threatened with closure have been cabled off so that you have to say only on the trail, and that has been a huge help. In just a few years the rest of the area is growing back, and people are still able to enjoy the area.
Basically they take a 6" diameter pipe run about six feet into the ground, with four feet above ground. Then they ran two levels of cable through it, just like an fence.
It worked really good, and has been really nice to get out on those tails again when they were closed and now slowly being re-opened.
I can find you links to some picts if you want to see what I mean.
Brian
EDIT: Link added
Specifically look at the area where they are eating lunch, and when they are coming back up the hills you can see what I am talking about in pretty good detail. This trail, Metberry Gulch, along with two others, was closed by a fire about six years ago, and we were told it would never be reopened, they just opened this year.
http://www.colorado4x4.org/vbb/showthread.php?t=121394