Well, we do know from life that change is inevitable. We can argue that change isn't always for the better, and most would agree. As long as humans are in control, there will be a mix of results from genius to mistakes. I would have to guess that since we have survived as a race, most of our results have not been catastrophic. I would assume, unlike some here, that the same is true in golf course renovations. Most are pretty darn good, but we also have "nightly news syndrome" where only the mistakes get attention.
We should also acknowledge that golf courses are here for humans and human enjoyment, not to exist in their own world, so the desire or fear of change should probably be factored in to whatever is done. That is a funny dichotomy. Most of us do fear change to some degree. On the other hand, most renovation results I see show that courses post renovation actually pick up play, suggesting they were successful, unless of course, you consider the opinions of a few of golfs supposed intelligentsia to be more important than those that actually foot the bills in these real world enterprises.
Short version, but true preservation in as near their historic configuration is really only for a select group of courses. Most others have dues and greens fees paid in 2015, and should be designed for whatever conditions exist for their users now.
Since their is no real governing body to decide which are the select few, we need to trust the custodians of the course to do the right thing. You would think, of course, that TOC would have been one of those on most anyone's select list. Its not truly a great tournament course anymore, other than the impact of playing something near its form of over 500 years ago (or at least 125 wen Old Tom made his mark) but even that turned out NOT to be the case with its caretakers. They apparently believed that keeping the Old Course relevant to todays Open Championship was more important (and I would guess overall best for the course) than keeping it in an older state so we could see it as it was (disregarding the constant change that had already gone into the course over the years)
Short version, I am with Forrest to a degree. Preservationists are probably fighting a losing battle. That said, if they didn't exist, someone would have to invent them just to keep folks honest. Certainly, an important part of the discussion.