Note, I fit into the category of "hobbyist," so disregard my comments as desired.
Golf courses aren't museum pieces, and can't be treated as such, but some lessons coming from the restoration of museum pieces might be instructive.
When it was decided some years ago to restore the Sistine Chapel ceiling (yea, sorry, I'm whipping out Michelangelo again), those who performed the restoration set out a set of guidelines that they would follow, and I believe that some of those rules, if followed by an architect undertaking the restoration of a course, could be useful.
In particular, they mandated "Detailed scietific and technical research before, during, and after the restoration," which seems like a no-brainer, but this notion has apparently not always been followed in some golf course restorations/remodels. Also, they specified "mandatory documentation of all procedures including filming, before, during and after, and archiving of the data on the work carried out." Thus, if later generations of gca's decide to "undo" the work of the current restoration, they have a specific roadmap of the changes that were made. Other goals for their project might or might not apply (transparency of the process, availability of restoration info to other architects, journalist, etc.). Lots of art aficianados (hobbyists?) are still hacked off about the results of the SC restoration, proving it's impossible to please everyone.
Perhaps this doesn't speak to the question of whether or not a "restoration mentality" is the right one, but for those courses that are deemed worthy of restoration...........there it is.