I think the amount of land you need for the good life depends on how many people you are feeding, what kind of animals you’ll be raising, whether you want to grow all your own hay and other animal feed, and whether you will want to keep a male of the species around.
Where I live, if you’re making all your own hay:
• You need around 5 acres per cow/calf pair, and then you’d want to keep quite a few cows to justify keeping a bull.
• For goats and sheep here, around 2 sheep/lamb or goat/kid pairs per acre seems about right. So to justify keeping a ram or buck, you’d probably want at least 3 acres.
In cooler or drier climates than mine you’ll probably need more land than that.
Without hay, you can keep double the amount of animals, but there are bad hay seasons, and relying on overpriced hay can be stressful.
For 3 acres and a cow, whatever calf the cow has would have to be butchered early, or you might have to buy in hay. 3 acres and goats could work.
Without hay, you can keep double the amount of animals, but there are bad hay seasons, and relying on overpriced hay can be stressful.
For any community venture, I think you’d need the right people, and it’s hard to know who the right people are until they’re put to the test. With dairy animals, some people might not understand how to fully strip the milk out (or might not think it’s important), which could lead to mastitis. Or that some people are good at picking up when something is wrong with the health of an animal and others aren’t. Different people have different priorities and different enthusiasm for things at different times and when animals are involved it’s important to know that they’ll be cared for at all times.
Also something to consider is what degree of self sufficiency you want to have, and what you personally find important to produce.
You can have a good life growing extra of the things that grow well for you and then using the barter/cash from that to buy in stuff that you don’t enjoy growing, then that can be a good part of a community food system, provided that there is a variety of stuff being produced in your local area and it’s not just 100 people growing excess bunches of kale to sell to other people with excess bunches of kale.