First, I think its great that a well known developer and architect are pushing very publicly for a shorter course, even if all of us can disagree somewhat on the details. As I mentioned in another post, so many golfers have been convinced that even though they are playing at 6300 yards, somehow its not a good course unless each hole has another 50 yards of tee behind it.
As to "want vs. need" despite the length obsession, my observation is most golfers pick courses mainly on the internet now. Pictures are great, reviews are good, but one component of a course search is yardage. If the average retail golfer likes to play at, say 5800 yards, he looks to see if the course has 5800 yard or similar tees. Same goes with 6300, 6800, 7000+, etc. If they aren't there, they go on to the next course to review it.
And, they wouldn't care a hoot about what golfclubatlas.com says, they know what they like and seek it out. Now, from our (architecture buffs) perspective, those things seem, sometimes, laughable. But they are like Popeye...."I yam what I yam.
I understand TD wants to change that mentality, somewhat one course at a time. Long slog, though. LOL.