In my opinion we need to have vegan commercial production.Organic farming harms more animals than modern "science-informed" farming. Animal feces in food also adds off-flavors; bacterial metabilic products are absorbed by the plants, through their roots. And it, and animal body parts, also causes disease. See Jared Diamond's books. Many of our diseases are the result of living in close proximity to animals. Including anthrax and tetanus. The micro-organisms that grow on plants are unlikely to find a good habitat on people; the micro-organisms that grow in animals, are more likely to.
There are advantages and disadvantages to using cows' gastro-intestinal systems in place of plain wooden compost bins. But as animal agriculture becomes a thing of the past, so will the ready availablity of animal excrement. I believe we should be preparing ahead, now, for this future that we all hope will happen, by using sustainable vegan agriculture instead of modern commercial, or organic.