You can't go the FS and say "no commercialism." That argument will lose with the forest service.
You'll get a better response from the FS if you argue: 1) that we'll lose access to accomodate extra commercial clients, and 2) guided clients may have a greater impact.
Does the average commercial user hasve a greater impact than some other group? If guided right, you would think they would have as little if not less impact than your average person. Maybe someone has actually studied this.
Bottom line, though if it happens, it will be about fairness in who gets the permits and whether the guides funk up the backcountry.