Since many clubs hadn’t significantly touched their course in 50+ years there was no ‘sunk cost’ mentality holding them back when their finances improved and better options were presented.
Well, 'better' is in the eye of the beholder, but I think it's fair to say that there were a lot of clubs that made a mess of their courses at some point in there, too. There was probably half a billion dollars sunk into new courses in Queensland from the 1980's forward, and not too many of them are high on this list. Just in Melbourne, Commonwealth, Huntingdale, Royal Melbourne (East) and Yarra Yarra all did some poor work in the early 2000's, and the renovations of courses around Sydney were pretty stale, too . . . Brian Slawnik will put one of his kids through college fixing stuff
that was just fine when I first saw it in 1988 [which is 30 years ago, ironically the time frame Mike used to discuss how much things have improved].
But there have been major improvements at a lot of courses more recently. It all comes down to talent and intent, really. Just like MacKenzie's landing in 1926 had a huge effect on the future of golf Down Under, Mike's work and ours and that of a couple of other architects has had a domino effect on getting those courses back up to snuff . . . and creating a few more worthwhile venues.