I have not seen hard evidence of length harming the game. Loads of conjecture and opinion, but no beef.
Sean, I don't meant to pick on you, I have not read the entire thread, yet.
BUT, Ben Dewar and I had a wonderful back and forth on the Comp Ball issue. One aspect he was able to convince me of was that the lengthening of a course like Torrey Pines south, and the associated increase in costs to maintain the newer version, were detrimental to the future of golf.
No longer will a kid, who has been able to save a few bucks, decide to spend it on a green fee. It's going to take alot for him to go out of the house, leave his XBox, and plunk down hard earned bling for the chance to soak up the sport.
The hysterical part of the reality is that courses which have zero to none chance of ever hosting an elite event, have gone on to disfigured their golf courses. And propbably more than once. (Ivanhoe CC in suburban Chicago, for i.e.)
No one would disfigure the Mona Lisa, and it's value is likely priceless. Yet, these well intentioned committees actually come to the conclusion that what they have for a golf course is not art.
Appreciating gca as an artform is the win win.