Ian - another take, just for the heck of it.
In one sense, the glory days of gca did end in 2008; but in another sense, they were only beginning. This recent phase of glory, however, has been double edged: a number of wonderful golf courses have indeed opened in North America since 2008, but they've all been emblematic a new golfing/design reality, i.e. let's call it the reality of the retail golfer. The new reality is this: if you are going to open in North America you'd better be a true -- and truly expensive -- destination experience (either public or private, it matters not.) And in that new reality, the little known/regional architect is dead -- just as dead as he/she was when the name brand-former-professionall-golfers-turned-architects were dominating the lucrative land-development/residential marketplace. So where does someone (to take a name from the past) like Rene Muyleart fit in. He was a regional architect who designed my current home course, the modest but very playable and enjoyable Victoria East Golf club in Guelph; each time I play it, I'm more and more impressed by the understated and subtly 'architectural' design, by its fine set of greens, the good drainage, the easy and flowing routing, and the variety of shots/options it allows and calls for. But alas: the new reality seems to have almost no place for modest, understated, easily walkable and inexpensively maintained courses that allow for subtle challenge and fun for all. (Those type of courses don't photograph well, and thus really louse up a 'best new' spread in a glossy magazine). And since there is little room for those kind of courses, there is little room for the regional architects who tend to design and build them. Maybe if/when golfers in North America start returning to their golfing roots and to humbler expectations we'll see a return to the fore of the regional architect.
Peter