Mark,
Any architect with only one course to his name?
I have heard industry rumors that CC courses are getting too much alike. Haven't played enough to know.
Certainly Doak has tried different styles, like the Rawls course, and most prides himself on minimalism and unique designs to the site, so he may be best suited to really keep a fresh style going. Still, I predict even he will have trouble unless he really gives each of his talented associates free reign, to the point of it being a different designer.
I have heard Pete Dye say he used inexperienced personnel to shape bunkers, etc. because they weren't trained to do it the same way as last time. Some truth to that, and I had one owner tell me that TD sometimes follows a similar model, but also sends in the A team or himself at the end to clean it up, if needed.
I would say my style can be recognized, but Brad Klein once said that it was hard to tell my Quarry at Giants Ridge and Wilderness at Fortune Bay were designed by the same guy, which was probably the best compliment I could have expected.
In the old days, Tillie had a variety of styles, which I usually attribute to vastly different construction crews, but Phil Young and others have different theories.
Its just hard. Just as most folks follow the same morning routine, if you design golf courses long enough, its hard to fight patterns, developed either out of human traits and habits, or from following what made you successful earlier.
And lastly, the RTJ forward trend was to create a brand, not just architecture, which negatively impacts a truly different look each time.