Its the same story in the 2 wheel world, We keep the trails to ourselves. There are so many hidden singletracks that we do not post publically. It may be sad but it is better that way for the few riders that use them. We already see that quads are cutting down trees to change our single track to quad trails. We now hide the entrances and exits.
Life has changed and even sadder is that the amount of people that actually fought for Waiporous was abysmal and that was a very popular place! So, in reality your respected opinion of letting every one know so they can all fight for the trails if it comes down to it, is sadly not true. AURS and AOHVA have had brutal turnouts since Waiporous closed.
TK