Jim, you are correct on this. Article 8 Section 4 states: "Fish,wildlife, grasslands and all other replenishable resources belonging to the State shall be utilized, developed and maintained on the sustained yield basis, subject to preferences among beneficial uses.  Charles Wolforth got it wrong.  Many on both sides of this issue make this mistake. 

Without the word "maximum," a different understanding is possible. "Sustained yield" may suggest a more conservative approach that does not dictate that managers push our natural systems to the "maximum."  History shows that in numerous cases the maximum directive has resulted in damage to the resource base. For example, herbivore populations exceeding carrying capacity, long term habitat damage and prolonged herbivore abundance. When this happens it is certainly not managing for "the maximum benefit of its people" as Section 2 states.