Well, I don't know exactly what kind of surveying and Digital Terrain Model process WGT uses, but the ones I work with (GPS, Total Station, Photogrammetry and Laser) are quite expensive - something even a truck full of Callaways can'y pay - and require plenty of work - put that with the photos and the physics engine and you have a hard job to do.
There are some courses, i.e. Wolf Creek, that would require a whoooole lot of surveying work to be fully digitized, because of the terrain characteristics.
Let's just be patient. Play some Blitz and Alternate Shot, have fun with your friends and wait for Congressional, Olympic, Merion, Pinehurst #2 and, with a little luck, Augusta and Morro do Chapéu :)