Arly, it's so sad to see, or learn, that the vast majority of the public is perfectly willing to stand back and let you pick up all of the expenses and effort to ensure they have a fun place to hike and ski. But... that's simply the truth of it all. I can relate totally with my experience in coaching Little League baseball. I've had people ask me how much that job paid even after seeing me pickup their kids to take them to practice and to play games, all the while they sit back and do nothing and make no offer to contribute to the expense nor effort.
I read every one of your posts and quickly realized that all of the expense and effort was born by you and your family. In thanks, I saw only a half dozen other comments from other facility users, with none actually offering to help. Hopefully there have been many others joining your effort. (?) If so, perhaps including pictures of them helping might encourage others to do the same. I and others on here perhaps did not realize the tremendous cost and effort it takes to maintain the Boundary Trail.
I suppose the only way to actually get others to assist is to quit yourself. Of course, the outcome would probably be that the trails would soon grow up and simply cease to exist. That's obviously not what you nor your family want. One alternative is to reduce the amount of trails that you maintain.
The trails have become your pride and purpose. Us remote readers easily can see that and appreciate the dedication you've given that goal. We enjoy reading about your accomplishments and learn a great deal about dealing with equipment and nature problems. And we understand the disappointment, especially with your injury, that others have not stepped in to pick up the slack. Sadly, that's just human nature. It's a "ME" world, as much as we wished that it were not.
My only (non-requested) advice is to continue as you have been, but only as long as you and your faimily have the energy, funds, and desire to do so. And you should not feel the pain of guilt if/when you reduce your effort. If there are truly others that appreciate having the nice trails, they'll step in and take up the slack. Or they'll simply have to accept the fact that it was good while it lasted.