Discussed this today. The concept is not ruled out, it could work, but there are some significant challenges. This particular model would be a difficult sell to the agency administrators. Generally the concept is challenged for fear that such a program might seem arbitrary and capricious, meaning that it would be a program established without sensible reasoning or accountability for consequences. Although we might be confident that something like this would work, the agency would have to be very confident that such a program will certainly work. We would need a significant amount of discussion on the matter and proof that it would work.
There are other issues. Some target practice (and trash left behind) that takes place in this drainage is in sensitive winter elk range. They want to shut those areas down to improve the quality of the winter range habitat. A sensible approach might designate certain areas for shooting that do not interfere with wintering ranges.
Apparently there were about a hundred people that attended the meeting regarding the proposed closures last week. Most were from shooting sports and Second Amendment rights-related associations.