Humans have evolved eating mainly meat over millions of years enabling our brains to grow in size as we developed more efficient ways on hunting large beasts. 

Fruit, vegetables and grains becoming a major part of our diet only for the last 13k years or so. Our brain size peaked then and has decreased in size since.

To get back to larger scale regenerative animal farming, we would have to make considerable changes. But if the demand is there and the steady but slow rate of adoption continues, capitalism and free markets will increase supply over time. Hopefully at the expense of massive areas of agriculture where they poison the land and kill billions of sentient animals in order to grow grains and vegetables.