Forget Hershel's farm, the group has been meandering around Atlanta and the surrounding areas for four or fiveyears, since season one. Rick has got them going around in circles. At least Abraham was trying to get somewhere. There could be other places where large populations have banded together to come up with solutions like walled off reinforced towns or cities with military fortification and defense, electricity, clean water, medicine, scientific research, periodic screenings, deceased body disposal, communications, government, transportation, jobs, and even entertainment. They could have a sense of near normalcy while they ride out the next 10-20 years it might take to figure out the plague. After a few years you'd figure there could be dozens of these types of fortifications across the country and around the world. In which case groups like Ricks would basically be out there scattered out in the wilderness or in makeshift encampments like Terminus and basically devolving into savages.
Sure you figure everything would fall apart in the early days and months, but we are a rather resourceful and resilient species. After chaos comes order.