Actually, there is great doubt. Many environmental campaigners are coming around to intensification broadly as the path out of our current environmental problems. Check out http://www.ecomodernism.org/ a bunch of ex-greenpeace types that are concerned with practical solutions. Tripling yield takes a long time and wheat, and especially corn, is on an exponential improvement curve. https://www.agry.purdue.edu/ext/corn/news/timeless/yieldtren...