I did not contemplate a distinction between fads and fashion. Nor do I think that parkland courses are of relatively short duration in America- as far as I can tell, though many early courses were built on mostly cleared land (cost of construction?), trees became a major design feature much earlier than 1950.
Consider also that our golf history does not go back significantly before 1900, so if a fashion is of much longer duration than a fad, then the 10-20 years of serious tree removal and widening of fairways might better qualify as a fad. BTW, I am a fan of wide fairways and trees not interfering with the lines of play so long as other design features add strategy and interest.
However, I am hearing more and more of golfers objecting to these things. In parkland areas, probably a good majority in America, I don't hear the praises for tree removal and wide fairways that we read on this site. Trinity Forest in Dallas is one of my favorite courses in the area, yet a good number of well-traveled, good golfers don't have a lot of love for it. I also know of two area clubs that did extensive tree removal and have a good number of members unhappy about it.
To Michael C and Niall- I have carefully considered MacKenzie's principles and tried to see where they applied to his courses. I hope they were ideals and not prescriptions because other than the lesser of his courses that I've played (Jockey-Red comes readily to mind), I can't think of how he approximated them on the ground. His beloved Pasatiempo, at least on this site, violates nearly every one at a point or another. Of his majors, CPC may fit the bill more closely, but it is hardly a championship course (I know of a Hall of Fame, major tournament winner who described it as a good muni with the Pacific Ocean as background; nonetheless, it is one of my three or four favorite courses in America). Having read both of the Good Doctor's small compilations and Tom Doak's excellent book, I tend to believe that the contrarian, utilitarian, frugal, economically conservative Scot (wannabe) would have already taken a different twist to today's fads/fashions.
Niall, hopefully we will have a chance to explore the subject matter at greater length during the Buda. I can't think of two compelling courses which contrast more (PVGC vs. CPC). When I was a Golfweek rater, the only serious criticism that I got from Dr. Klein was that I seemed to like golf courses too much. I attempted to show him through a mix analysis of the courses I had rated that perhaps that was not the case, but I took it as a compliment. I do like golf courses of different types a lot. I see no dissonance here, only perhaps that I would not be a good critic in the sense that he was/is one.