We have what's needed for those big dairies - lots of room so they can be away from people. What we lack is another essential - water. A dairy like that uses a million gal a day or more. A cow needs 10 gal just for the milk she produces, in addition to body functions and cleanup. Many of the farms are now composting the manure and spreading it on their hay fields. Plants can use compost more efficiently and it reduces potential pollution in the water table.
If you want to buy some rural land here, you'd do well to carefully study Google Earth, looking for dairies and feedlots upwind of any property you're interested in. I've seen very very nice, low priced properties downwind of a dairy. They're sometimes impossible to sell.
