Really “cavemanship” was small tribes with basically a socialist economy and that only scales so far, what we have today is 14,000 years worth of societal progress towards social structures that can support more than 150 people who all live together and know each other. If we fell back to that state we'd start developing past it as soon as there were enough resources available to support more than that amount of people - the end result might not be what we have today, but it probably would be more similar to it than to the starting point.