Pat
I don't think any membership ever consciously tries to negatively affect the architecture or playability of their golf course(s). Rather, I would suspect that every change that you or I could think of was done with the most noble of motives in the minds of the memberships/committees and/or Captains/Presidents who initiated them. However, as we both know, in many, perhaps even most, cases no change is really needed--particularly for great courses without "championship" ambitions.
This is not to say, however, that no course cannot be "improved." I have never played a course that I didn't think could be made "better" by some tweaking or another, and as you know I have played a goodly portion of the courses that most participants on this site consider to be "great." That, however, does not mean that such changes MUST be made, or even should be made. Imperfections are a part of life, and in many ways one of the charms of interesting things, including golf courses.
However, humans are humans, and my experience with golf (and other) managements and committees tells me that the instinct for people who are given postions of power is to "mark" their territory, just like wild animals. In corporations, this marking often involves reogranization for its own sake, rather than for any particular need. In golf clubs, it usually involves some sort of capital project. If you are lucky, your President will be into clubhouse reconstruction. If not, he will be an amateur architect--even to the extent of possibly lurking here on GCA!
That being said, a lot of changes that are made are made for the better. TPC Sawgrass is a lot better today than it was in the early 80'. My understanding is that the new 5th at Pebbble Beach is a positive change. The 6 new holes at Dornoch built in 1946 are a vast improvement on the holes they replaced. Virtually all the great British and Irish links courses were changed dramatically (and probably for the better) in the first 2 decades of the last century. Continuously moving the tees back at places like TOC, Augusta, Troon and Merion to accommodate the pros is probably a good idea, and in any case not deleterious to our ability to enjoy those courses.
Life goes on, o-bla-di, o-bla-da.......