Thanks, Tim.
You (and Tom, see his response) are probably right. At the very least, I probably shouldn't have described architecture's golden age as a product of happenstance. What I meant to say was that, in comparison to the "organizational structures" in place during Hollywood's heyday, the gca equivalent seems more like a "loose affiliation" of like-minded talents. But mostly, I was just trying to get a handle on what RTJII might've meant in saying that there was no golden age -- and speculated that he meant something like the above.