Yes, more trees. But also, a few more Mormons, Church of God evangelicals, and a couple more Jonestown victims. People who would have joined the witnesses would have chosen another cult/fundamentalist religion. Others might have taken that college scholarship or opportunity to train for the Olympics.
Tho they are barely a blip on the world scene, it still feels like there would be a lot more acceptance and a lot less judgmentalism if they never existed. But people that have that need in their blood could have easily chosen a similar theology.