Everyone should read Mother Earth News!
Now just imagine all that being done by enough very simple automation that it only took one person about 10 minutes per day to maintain that whole farm. Then imagine the cost of all this 'equipment' was such that you could pay it off in 2-3 years with the same money you currently spend on those items.
Personally, I'm going a bit larger scale. I'm working on getting 160 acres that has 95 acres of forest and pretty strong stream. The plan is to put in a livestock pond, a small orchard, raise a couple of whatever meat we want plus chickens, wheat and then integrate that with everything else growing aquaponically. The dairy aspect is the only aspect we're staying away from. Couple all this with energy from CSP solar (my business), a digester and/or a gasifier. (We'll see how things go) If things go well, we'd like to hire in someone to do a Permaculture on the remaining land.
All in all, for the goods we get out of it, it all should pay for itself in about 4 years. After that, it's play time!