Bob,
Wonderful post, and I had forgotten about Peachtree as a seminal moment in young Robert Tranakin Skywalker Jones's career.
As far as not repeating history, some months ago I started a thread in which I asked "which architect is going to save golf?". I would have been better served to have titled it "which architect is going to save golf course architecture?", because in it I argued that some inventive designer is going to have to come up with a better mousetrap, without resorting to the Dark Side of total penality. The advances in technology are even more pronounced right now than they were between 1930 & 1950, and I'm hoping that some architectural genius, either current or future, will lead the way by simply coming up with something no one has thought of before. Looking back is fine, but progress...real progress, is better, if someone figures out how to do it. It's why I asked Steve Smyers for his ideas on how to provide both challenge and playability in his courses when a 450 yard par four is drive and short-iron for top players on the recent thread.
Two weeks ago, I talked here about a new course I had played in NJ where the designer clearly let fear and emotion turn him to the very darkest side I've ever seen. After the round, the four of us were discussing it, and decided that we wouldn't play there again even if they paid us to, despite the beautiful property, scenic overload, and fine conditioning.
We would have been safer and had a better time in a stinking Tatooian barroom.
So, we have RTJ as an example (Rees....I AM your father!
sorry...couldn't resist), but what will present day designers learn from courses built a long time ago. Hopefully, some young Luke Skywalkers will lead the charge in ways most of us can't even imagine yet.