Ronald,
I am going to bet most of the mid level gca's got their work altered at some point, as part of the same thought process as any other course got altered. It was "time for change" to then current "sensibilities."
Joe makes good points with which I agree. I will add that the situations are all so different that the only overriding mantra might be, "Keep what works, and fix what doesn't work anymore." That should be on a per course basis, not a per architect basis. Oh, I suppose someone could get organized enough to create a list to preserve the best 1-3 candidates of every major architect (perhaps using ASGCA membership to start, and adding as required by course numbers, i.e., no sense restoring the best 3 of the only 3 courses Joe Blow designed)
And, there are so many courses that were, for example, private, but are changing to a public role, so the question of what works often isn't about the original design, it's what works for the future of THAT course and keeping it's tee sheets full and costs down. (Obvious bias for the kind of work that is going on now, but a good reminder for the next time high budgets hit renovations at all levels, times won't always be good, so don't be too extravagant.)
That seems like a crazy thought, but a practical example might be - Would someone restoring a Pete Dye course keep all the 1000's of yards of strip sand bunkers? I mean, they might be there now, but even TPC Jacksonville got rid of a lot of them as impractical.
Or, like Don, I have renovated more than a few Plummer courses. In general, other than supers who maintain them, not many have sung the praises of what his bunkers were (or at least had become) which were too different from Robert Bruce Harris' clamshell bunkers. If a current generation of more visually attuned golfers don't like simply shaped bunkers, why would you suggest to a struggling owner that they are worth restoring?
For that matter, those of us in the "lesser architect" arena would probably tell you (and really, it would be a great idea to write it down) that every project we had could have stood another $100,000, $250,000 or even Million dollars to do right. So in a way, is it worth restoring what was a "compromised design?"
Short version, I see a lot of reasons to say no.....and if I have time, I may even type out my response as to why that would include my own courses! A shorter version of that is, I won't have any control over it anyway, I'll be dead and won't care, so why spend a minute worrying about whether someone wants to restore my courses or update them?
Happy New Year to All!