All of this is conjecture/thinking on my part.
One thing I have found interesting is that the (supposed bacteria), dies with the animal, and that is why they can't get anywhere with their study... However, the bacteria can live up to 3 weeks to a month in the soil. Seems like they could take soil samples where infected elk are hanging out and find the bacteria and probably still alive...
And yet hunters are being told not to keep the feet/hooves, so is the bacteria really dead when the animal dies?