MG can survive outside of a host for 2 to 4 days.Also, assuming I start over and get MG-free birds, MG isn't going to be living in the soil or carried on the wind, etc? It's not going to be a situation where some chicken flock down yonder spreads MG through the wind and then I'm stuck in the same situation? MG can be spread by wild birds too right?
Yes, wild birds can have MG and spread it.