Any sign of the club buying a permanent home out of the city and the support would disappear. As others have said, perfect for the insects, better size for them and there is a bigger (and potential less fickle) population to tap in to.
A bigger statement would be to sell out away games but take nobody to MK. If you really can’t see why going to games at MK while refusing to attend St Andrew’s is flawed there is nothing anybody can do for you