Tommy,
Random thoughts -
Routing probably won't ever be homogenized, because every site is different. Features have been homogenized many times over the years, for different reasons-
Construction technology (from bulldozers to irrigation, to PVC drainage pipes, to USGA greens, to bunker liners, etc.) It didn't take long for designers to figure out, and then repeat, their best ways to use those technologies. GCA's may not have had a choice, either, as the manufacturers sales forces were pretty persistent. Who would recommend hand watering when automatic irrigation was available? Or topsoil greens when the USGA said their method was "proven" to make better greens? Technology has gone a long way to making regional designs look and play more similar than almost anything, as has the trend to hire national architects in every region, rather than rely more on closer ones to the project.
Generational trendsetters - i.e., copycat design, from MacKenzie, to RTJ after WWII, to Pete Dye in the 60's, to faux links (which I date to the ASGCA trip to Scotland in 1981) to Fazio perfection in the 90's, and then to the more rugged look post 2000, which we can perhaps call the Sand Hills look. Or maybe even non architect Mike Keiser influencing design as much as the USGA blue coats did earlier?
The funny thing is, when I first started coming on here, many had a preference for C and C and Doak because they believed so many were touting Fazio to be trendy and they wanted something different. At some point, the rugged look may become passe around even here, lest participants get accused of name dropping architects and preferences. It's bound to happen!
The market for gca isn't much different than markets for any other product. Once something becomes too established and repetitive, there is room for some young whippersnapper to come in with something new.