One thing I saw growing up in the Central Valley of CA was not just increasing specialization by each operator but the change to increasing specialization regionally.
When I was young, there was a huge variety of fruit and vegetables to supply the many canneries and there were poultry, dairy and beef operations all cheek by jowl.
Fast, cheap, refrigerated transport from virtually anywhere in the world and just about year-round along with hybrids designed to ship and not necessarily eat, put an end to most of the canneries except tomatoes. The egg and poultry operations moved to the foothills where land was cheap and they could spread out and build huge houses. Small milk bottlers and creameries and cheese factories merged into ever larger and distant plants.
Gradually each soil type and climate range became more specialized to the crop most suitable to the area. In the area where I grew up, where once you could once see virtually any food you might want growing in a one or 2 mile range, now is almost totally almonds. I think CA, with that county at the center grows more almonds than any other in the world.
I know it is popular to bad mouth Monsanto, ADM and all, but most every part of that particular production chain; from sprayers to shakers to pick-up machines and hullers to haulers to packers are owned by little guys. Mostly all family businesses and each one invested in and dependent on one crop that is shipped all over the world.
Also in my old home town is the largest winery in the world, up the road ten miles, the headquarters of the biggest egg producer west of the Rockies and 20 miles the other way the largest cheese plant under one roof in the US - they make cheese in 55 gallon drums to put in your mac and cheese and on your Taco Bell taco.
So it isn't just mono culture at the farm level that seems the biggest hurdle for change in my mind, it is mono culture at the regional level in those areas with huge investments in infrastructure all geared to one specialty crop with a huge marketing range - worldwide in some cases and few people around who know anything different.
Having said all that, here are some threads about new-old ways, most have lots of good links:
No-till and other conservation tillage
A snip of a snip...
“South-central Pennsylvania vegetable grower Steve Groff is pioneering what he calls "New Generation Cropping Systems," which emphasize no-till transplanting vegetables with a customized Holland transplanter into cover crops killed with a Buffalo rolling stalk chopper.”
Grass Farming
Snip from Gene Logsdon paraphrased...
He talks about the inevitable rise in fossil fuel costs and his and others attempts to achieve animal production without the use of fossil fuel powered equipment. The method is grass farming, which in a nutshell is rotational grazing to slaughter weight of animals on a number of small plots for quick, uniform grazing of the pasture before moving on to the next plot; allowing the first to recover and regrow.
Who Will Be The New Small Farmer?
The new Small Town
Especially the writings of this guy
The legitimate object of government, is to do for a community of people, whatever they need to have done, but can not do, at all, or can not, so well do, for themselves -- in their separate, and individual capacities.
-- Abraham Lincoln, Fragment on Government (July 1, 1854)