The article doesn't answer the question at the fundamental level. The closest it gets is this: "Increased frequency depends heavily on the current level of technology and advances cannot move beyond these physical limitations."

Certainly, Moore's law is just an observation and cannot go on forever. Would it fair to say that we've simply reached the point where we can no longer "keep up" with Moore's observation because the technology is getting harder and not because we've actually reached any limit of physics?