I would tell him in the kindest way possible, that you want to lower the hunting pressure on your property for a time (which isn't a stretch due to you're current process of implementing a management program). The best way to do this is limiting the amount of access to your properties. Now if he's willing to help in the spring time (he must in order to gain access next year) find things that need to be done, make a note and when the spring time rolls around, ask him if he is interested in hunting the property that fall. If so, break out the list and tell him what needs to be done and if he shows up to help; great! He can hunt in the fall. If not; no work, no play!