I think Matt is on to the right explanation. I'd say along those lines that it is a convergence of well studied and well travelled architects collaborating with discriminating and purpose driven owner/developers that have created these site specific golf architecture design efforts. A few golf writers (particularly Whitten and Cornish in their first edition book) lit the fire of imagination on encouraging developers and certain architects to reflect back onto the historical nature of the grand old courses of the game and 'where' they could be emulated in similar site terrain in modern courses (whether those new intended development sites were private clubs or CCFADs)
Anotherwords, a guy like Kohler first hired Dye to do BWR and that design wasn't really anything of a breakout design for a parkland course. It was very good design in its specific layout of the golf holes, but still it fit the parkland site and was high quality compatible with the overall American Club. Then Dye went to Kiawah and designed what he knew from experience and travel to the great old links - seaside courses to be a specific venue for an historic Ryder Cup, and what would be a seaside resort CCFAD course to incorporate the need for competition and proper aethetics for that geographic area. He fit that to the site specific nature. Yet in other site specific areas, he still designed parkland appropriate venues. He didn't try to fit a round peg into square holes.... yet. But, when Dye got the marching orders from Kohler back at Whistling Straits, they did sort of put a round peg (desire to have a somewhat Irish dunes-links on a property that wasn't that at all) Thus some see it as a great construction triumph, and some see it as unnatural and strained.
After Kiawah, a keen golf owner-developer like Youngscapp comes along (with some inspriation of all the possibilities that the sand hills held for site specific emmumlation of a dunes-links like design in the heart of the country as pondered by Whitten's love of his native sand hills, far from seaside shores) Youngscapp wanted Dye first, then Dye recommended Coore and Crenshaw. And, due to their experience and knowledge of links golf, and desire for minimalist disturbance approach to that great land, and the keen insight of a owner developer they came up with a design that started a new round of owner-developer and architect awareness of the unique and appealing nature of this sort of approach to golf designs, and that it would work as destination venues, if site specific.
Then more keen owner-developers with a greater sense of historical golf said they wanted to do more of that and we get the guys like Kaiser, Bakst, etc. They spawned a new collaboartive vision of harkening back to the golf roots. But, they are still site restricted. They still can't put parkland designs in sand hill or seaside courses without drawing criticsim and ridicule. Yet, there are those owner developers that have little sense of place and appropriateness, and hire a name pro-designer for their marketting appeal, who also have little sense of site appropriateness. And there is where we see the ugly side of trend following gimicks, waterfalls and glitz and artificial features designed for sales, not golf appropriate site sensitive design.
So Pat, I'm trying to say that we have winners and losers in the realm of owner-developer collaborations with keen architects who know how to do site appropriate golf designs. Some have taste and restraint, some go for the marketting sizzle of glitz and artificiality. It is a mixed bag. But at least there has developed a trend or rennaisance philosophy by many architects and developers to go the site sensitive, traditional and historic revival.