Jeff:
I am not so sure about your last paragraph. Was there anything really "wrong" with the playability of Oakland Hills or Oak Hill, before RTJ and the Fazios changed them? I think those changes were strictly to make the golf course harder for tournament play . . . and that many of those "500 clubs" followed suit in adding back tees and moving bunkers around.
Tom, I have a hunch that many courses were in bad shape after the gas rations and other problems of WWII, and since they needed work, they also took a look at the design. You and others are just assuming all was great after years of neglect. Also, I know from my father that they came back from WWII and were looking for entirely new design styles (think Art Deco) and were in no mood to remember the last 15 years of suffering. Perfectly logical to me, and far more important to design for now and the future (then or now) than to be held to the architect's original intent (which as I hint in the first PP was probably lost a long time ago back then)
Your Oakland Hills example is an interesting one. They had initially called Ross to renovate it for the 1951 Open, and his plan wasn't really much different than what RTJ came up with (I saw the original red marked Ross plan in the maintenance building, so I know). So, Ross was perfectly willing to renovate his course for a specific reason, i.e., tournaments. The fact that his and RTJ's plans were so similar may suggest that the USGA was driving the boat on the design changes, not the gca and not the club members. So, examples are all over the map of why courses got changed, and I still disagree with the notion that those WWII vets were somehow misguided by today's conventions.
Similarly, many of that generation of gca's is critiqued for designing real estate courses. But, while driving distances in the US Open were one distance issue, the most important distance issue post WWII was the driving distance.....from your front door to the first tee.
And as if karma to confirm my post, I just saw some pics of Augusta no. 12 from 1952. In addition to some maintenance issues, there was nothing in that iteration of the hole design that was superior to what they changed it to later.