To the answer of this specific question, please note I do not want it to necessarily happen, is to use capital to solve the access issue. At least in theory it could work here, in TN.
For example; a large corporation could come in and gobble up as much access as its capital would allow. It would be governed by a board of directors and financed by members.
Basically just one big hunting club. Dues would be manageable and not a complete burden on its members. To achieve this the corporation would lease up duck property, small game property, fishing property, camping, turkey, deer, bear, etc. The corporation would have "buying" power and pass the cost savings on to its paying members. The duck hunters would subsidize the deer hunters, the turkey hunters would subsidize the rabbit hunters, etc. So, instead of having one big deer hunting club you'd have one big recreational club spread throughout the state.
Access would be granted via a reservation system. Membership would be granted based on hunting preferences, so not to have too many deer or duck hunters.
Or, these non profits who claim to want to preserve the hunting heritage would simply invest their money into access.