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Those who think they'll make do by hunkering down and protecting their turf, in my opinion (and I respect that each person has a right to live in the manner they choose) is shortsighted and selfish. Pooling resources, skills, tools, supplies and extolling the values of community, rule of law and fairplay would provide the best chance for the us and the nation to renew and rebuild.
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I suspect most who envision "hunkering down and protecting their turf" have exactly the pooling resources [with like-minded neighbors] plan you mention in mind. Give them credit for not being short-sighted or selfish. Even those that might think they can or would survive "all alone", would most likely end up doing just as you suggest as being the optimum plan for survival.