I think the distinction you're highlighting is between the people who start the giant companies of the industry, and the people who keep those companies success

I think the distinction you're highlighting is between the people who start the giant companies of the industry, and the people who keep those companies successful. Everyone knows that Noyce/Moore/Grove built Intel, not many people knows who runs it today. The '50s computing leaders (mostly academics) are in their old age, the '70s leaders (academics and businessmen) are heading into retirement (except for Jobs unfortunately), and the later leaders (Google, Facebook) are still going strong.