Something else that's been on my mind:
For a dairy farm (whether it's cows or sheep or goat or all of the above), if you're roating your herds along different areas, it seems to me that if your grazing area was big enough, it could make some sense to have a mobile milking parlor, rather than a fixed one where all your herds have to be dragged to every day, as they go back and forth from the grazing lands to the milking parlor.
Also I've seen a documentary once where they showed dairy cows willfully entering the milking parlor and hooking themselves onto the automatic milking machines (the hooking was automatic with the movements being controlled by a computer) without being led there. I found that very suspicious. Do you think that happens with organically raised cows who have to be kept constantly pregnant or with a young calf, or is it something that just happens with cows that are given huge amounts of hormones to increase milk production?
These exist in several forms including massive trailers that cows actually load up into to be milked. Yes some organic farms do use robotic milking equipment. These artifacts allow cows to milk themselves whenever they desire. I'm not a big fan, especially since those units run about a million dollars per one, however there are some advantages.
Salatin no longer uses MIG. I don't know exactly what he does but it's pretty much HM. MIG tells you to graze grass in it's most rapid growth spurts. HM says exactly the opposite. HM says allow forages to reach sexual maturity before grazing them and if you don't allow them to reach sexual maturity before they are grazed a second time. Do not graze one field more than once before allowing every desired species to reach maturity. HM utilizes STOCKPILED forages (tall yellow grass generally with weeds growing up in between).
HM is not always more healthy for livestock than MIG, MIG is generally healthier for your herd, however in the long run, HM will produce superior forages and superior animals and superior yields. Using HM allows pastures to evolve in the most similar way to natural probably still possible in most parts of the world today.
The first 5 years of HM perhaps Sabertooth, would be inferior to truly free range wilderness. But after those 5 years of good management, most farms will surely be superior and produce superior produce to most of the wilderness left on the planet.
I don't even think it's just a problem of farmers wanting more money. Like you guys say, few of them make much money. I don't think this is because farming isn't profitable. I think it is because humans in general are kind of stupid and aren't very good at making their own decisions. They watch what their neighbors do and they follow suit. Organic farms typically largely resemble their conventional neighbors and can only be told apart from a distance by discerning eyes. Farmers who have trouble running their business generally shoot for a better quality of life, so they make farm decisions based on whatever it is that suits their needs. Like only buying a farm with a really nice house, getting some horses to ride around on, buying a great big tractor and a bunch of new hay making equipment. How about a SILO. All of those things could by themselves make a farm unprofitable! Joel Salatin calls SILOS "bankruptcy tubes".
HM is different. Practicing HM forces the farmer to create a grazing plan. It forces the farmer to learn everything he can about his farm and how to improve it. It forces the farmer to think about his farm and ever way it impacts the earth and the local community. Using HM allows the farmer to know when to sell animals or when to buy animals to manage the available forage on his land. Generally utilizing HM, land can support as many as twice as many animals in the second year and as many as 5 times as many animals or sometimes even more in as little as 5 years.
Holistic management forces you to consider things that almost no one ever does. It forces you to consider everything involved in your life and your environment. Similar to Permaculture, many claim holistic management but fewer truly practice it. Most are limited by land space like you said. When you graze for grass instead of grazing for cattle, really amazing things start to happen. Diversity and pasture quality skyrockets. Turns out cows and grass were meant to be together.