Product Marketing Leaders - Are They the Future CMOs?

We've often heard that product marketers are the future CMOs and even CEOs of tech companies. In your own specific experience, what are some of the traditional product marketing skills you have found to be most helpful in your time as a CMO? We see more and more product marketers get into the C suite. I think the thing that gives them the edge A is seeing the holistic picture of the company, right? But B, it's customer intimacy.