Patrick--I cannot really answer that question about Merion directly. But I can put it like this, IF those greens are too severe, like say, the 17th at Olympic (remember the 4 putts from '97?) and they would cause undue stupidity, then yes, break out the bulldozers. Pete Dye has admitted to doing much the same to many of his courses, saying the speed of the greens are out of control for the original contours. Now, if they greens are simply undulated with some flat spots as to allow for reasonable putting at the given speeds, then no change is needed. I can't give a real answer to the question since I have never played Merion. (Now if you are a member at Merion and would like me to come play to validate the theory, I will certainly come, wasting no time)
--I do not know Oak Hill prior to the restoration to give comment.
--Clubs are spending money today to "restore" the clubs because that is their view of what the clubs heritage is. Many years ago, the members that changed the club had a different view on what that heritage was. Which ones are right? I'm not sure.
--You are correct, there are no absolutes, not in situations like these. What is correct to one is incorrect to another. What is disfigurement to this person may be beautification to another. I may say that by doing a certain thing a club is valuing its pedigree, whereas you may say they are destroying it. I do look at the entire film, however, just like your analysis of the ending of Citizen Kane may be different than mine, your analysis of the end result of course redesigns may also be different than mine.