I wanted my birds tested-- state said do not test. I TOTALLY agree with you!! I would like to know I am buying from clean flocks and then close my flock.The one bird that I kept after it had a swollen sinus is my peacock. That was in Oct '08, and it never came back. If yours are going down with no medication, that's actually really promising. In a lot of cases, it stays and hardens, then it needs to be cut out.
As far as MG being on most farms? If folks tested for it and didn't breed or sell birds from an infected flock, perhaps it could be eradicated.