I disagree with the notion that people aren't clamoring for TOC or Fenway Park.
Maybe not exact replicas, but designers are being asked to design "classically-styled" golf courses all the time. See BD, PD, BT, Sebonack, SH, Ballyneal, etc...
Concurrently, every new ballpark is built in the "retro" style with brick facades, old-style scoreboards, etc. This was started with Camden Yards, and has continued to SBC Park in SF, Comerica in Detroit, Coors Field, Minute Maid Park in Houston, Miller Park in Milwaukee, Citizens Bank Ballpark, The Ballpark at Arlington, etc...Just check out plans for the Mets tribute to Ebbets Field and the "New" Yankee Stadium will look just like the original one from the outside.
All clearly emulate Fenway and Wrigley with more seats and better amenities, much like new "classically-styled" golf courses use more modern maintenance, irrigation, and turfgrass technology.
Check out the HOK sport website, the company that designs some of these retro ballparks, and in many ways, it compares favorably to that of Renaissance Golf Design in the GCA world. HOK even does improvements to places like Wrigley, just like the restoration/renovation architects of today.
http://www.hoksve.com/sport/projects/proj_list_alpha_1.htm