I was on the JMT July 7th to the 29th. My wife and I had a lot of ultralight gear but it was mostly a means to an end–she being a 105 pound 5'2" human, I had to carry the majority of our shared gear and food to make it a comfortable adventure for her. In addition, we carried quite a bit of photography equipment, tenkara, and some other comfort items like a frying pan and mugs. So I was the human on the trail with the cuben fiber ULA Circuit with 30+ pounds in it. : )
Many folks I ran in to had a few elements of UL gear but hadn't fully made the transition. I fielded a lot of questions about my pack, our trailstar, and the tenkara set up, and it seemed like younger people are interested and fundamentally heading the direction of lighter packs. They just may not have fully transitioned.