Why would they need to keep Hershel's farm? If they are trying to keep their humanity would strong arming an old man for his resources be the way to go? I would say no. If they needed a safe base, could they not have established their own base of operations? If there was one big farm there, would their not be others? I think some of them were still tied to the idea of going to Benning. Some saw the comfort and liked the stability. I don't know that they all had made a conscious choice. I think Rick had because Lori is pregnant. He wanted to stay at H's place. So did Carol and Daryl because of Sophia.