What does safety have to do with parity? It's a reason for NASCAR to set minimum standards, but not a reason to keep one manufacturer from outrunning the others. As long as those standards are met, how is safety hampered by manufacturer dominance?
GM no longer sells the most cars in the US, and (as I noted earlier), fans can no longer buy what's on the track anyway. I still don't get how this piece of history is relevant today. Will reigning in any of the current manufacturers inspire Dodge to return, or any other brand to jump in? Do you think failing to do so will cause Ford or Chevy to leave?