Here in Montana we went through something similar with fenced elk farms a few years ago--which also shouldn't have been allowed in the first place.
As it turned out, not only were a number of elk "breeders" lax about their fencing, allowing plenty of potential for CWD-infected animals to infect wild elk, but at least one fenced operation was herding wild elk inside its fences. Instead of outlawing game farms, however, we simply outlawed "hunting" the tame elk inside the enclosures.
The owners can still sell the meat, hides and antlers, just like cattle ranchers can sell their animals, but without the massive $$$$ paid by some people to shoot huge-antlered bulls inside corrals, there wasn't any reason to import genetically "enhanced" elk, and the chance of CWD dropped enormously.
