Careful what you wish for !!
Just thinking kind of out loud, in as much as words can be read out loud. Ivan is my vet friend and cohort, and I think it safe to say that with the huge size of the dog lobby, dog lovers, dog money, etc, if a dog-only disease can't initiate imposed quarantines, then a boid disease will not either. Most of us do have to have a permit to do what we do in our given states, and different states mandate certain hygenic conditions. But IBD is not clearly indicative of a condition that would violate even stringent antiseptic standards. And just for conjecture's sake, lets say you could contact some entity that would legally step in to "quarantine" a hobbyist breeder, essentially shutting them down for some period of time pending tests and other rigors until issuing a clean bill of health. Despite BW's own internal efforts to run a very clean ship, couldn't someone put the authorities on to him, since he has a confirmed incident, and shut him down until he passes their muster. IBD would seem to already be the "kiss of death" in more ways than one. Besides potentially infesting and killing animals within a collection before it is contained (similar to PCH 101's story of his friends), once a person is identified as having had it, whether it be the apparent carelessness of Susan, and now in the meticulous confines of BW's collection, people might rightfully avoid Susan's animals, but maybe also avoid BW's as well. Is it fair? Doesn't matter. An IBD tag, even if unearned, could be like the scarlet letter. I don't know that any other solution is practical outside of "buyer beware" and the hobby's own mechanisms, such as this forum.