I'm sure the AMA has some numbers, such as how many AMA members are park flyers vs full privilege membership. That percentage could give them a rough estimate of how many traditional flyers may come knocking on their doors once the RID goes into effect. I suspect(that experience thing again) that most non AMA giant scale flyers could also care less about being registered. That assumption is based on them being primarily rural and private property operations that have no intent on flying at AMA sanctioned events. Rural America is still a vast amount of space.