I remember having this discussion with the elder I worked for way back when. There were some at our KH who would discuss those scriptures (and the lovely drawings in the literature) about preditory animals suddenly eating straw and frolicking with former prey and wouldn't that extend to the human family, yadayada reasonable to assume blahblah humans become vegitarian in the new system. He didn't like that idea at all. His face got all red and he literally pouted as he reminded me of the scripture in Isaiah 25:6 - 8 about the table Jehovah would prepare with wine and fat things with "marrow". He did not want to think that paradise might be meatless. It was kind of fun yanking his chain now and then.