I looked that over and they don't say what the threat is. And it also says that you would still go to different trails and continue to recreate in that area if it was closed. So you are saying "close it, you'll still get my tourist dollars".
The better letter would be "I only come to Homewood/Tahoe to do the Rubicon, close it and I'll spend my dollars elsewhere".
Maybe I missed something. It sounds like a bait/switch thing to me.
On edit: third fax goes here-- http://www.gallerybartonlaw.com/contact.html