Cambridge University came out with a report on Sustainable Livestock Production. It can be found here: http://www.cam.ac.uk/research/news/sustainable-livestock-production...
Here's is one of the quotes by Professor Broom from the article: "It is clear that silvopastoral systems increase biodiversity, improve animal welfare, and provide good working conditions while enabling a profitable farming business. The next step is to get farmers to adopt this proven, sustainable model."
Getting livestock farmers to adopt silvopasturing when many don't even practice sound rotational grazing nor sound forest management (yet) seems like a daunting challenge. But the rules of the game are changing quickly, so those who don't adapt and adopt more profitable and sustainable practices are probably not going to stay in business - and will make room for others who will.