Patrick,
I don't think architecture should remain static, simply because I doubt one single person can bring any 18 holes on a particular patch of land to perfection. To think otherwise is surely arrogant or misguided, isn't it? If Donald Ross was the sole person responsible for Pinehurst number two, he refined it over a number of years, and from what I have read of him, was an unusually humble person, especially for someone who was so skilled at his particular craft.
All designers obviously have their own ideas and biases, which may subconsciously, if nothing else, influence why any one hole comes out as it does.
Have any of the revered golf courses been the sole product of one, or even two, people? Maybe NGLA? But that resulted from one man's studies overseas, and sole determination to construct the ultimate course.
Royal Melbourne may have been designed by Mackenzie, but Russell and Morcom brought it to fruition, and later Crockford, and club member Ivo Whitton, modified or built other holes to make it what it is today. In particualr the 135 metre par 3 7th West, and moving the green on the 425 metre 12th West.
Time, and therefore cost, must also be a consideration on how much time anyone can spend on a single project, lovingly crafting it to completion.
Who should decide is probably the hardest part of all. I would think someone who is interested in the art of architecture, and has made some sort of study of great courses, and who can elucidate exactly what is 'lacking' in any current hole, and can demonstrate exactly why their proposed solution would engender a better result, as opposed to someone doing it specifically for the money. Someone who is also open and eager to discuss and share ideas with others. That word humble again, perhaps?
Sorry to use another Sandbelt example, but Commonwealth here in Melbourne was designed by one bloke, modified by a secretary/manager who travelled abroad to study architecture, and indeed built some of the features himself, and was then further refined and finished by another longtime secretary/manager.
In recent years, the course has undergone many contentious changes by a club committee apparently obsessed with increasing the difficulty of a relatively short course, and engaged several architects who had no idea or interest in making their work fit in with the existing condtruction. Result? A wonderful course partially decimated. I don't know the committee people responsible, but I would doubt any of them had a real interest in great courses and great architecture, and humble would probably be the last word to describe them.
Given the results, they obviously don't care. Admitting you've made drastic mistakes in the past is a human frailty no one generally wants to be responsible for.