Honestly, I can't say that there isn't some epigenetic factor that has contributed to development in ratcheting over the past 10,000 years, but it seems that a persons ability to continue this process is more dependent on socio-cultural factors, as opposed to ancestry. But there will probably need to be a lot of research to make the case that epigenetics played a role. Personally, I don't think it's possible that it played a larger role than environmental factors. How do you suppose you could test for that?
Certainly, it would be foolish to argue that epigenetics are a bigger piece of the puzzle than environment alone. But, I think that Lamarkian evolution has found a place in epigenetics, and Lamarkian evolution, while subtler, can work orders of magnitude faster than its Darwinian cousin. I would be surprised if epigenetics played no role in culture formation. It has been shown that epigentic changes can predispose rats to aggression. It stands to reason that the opposite could be true. The less war-like we become, the less-warlike our progeny may be. Hence, we can build bridges (literally and figuratively).