I'm just a pre-med so I'm not going to pretend to be an expert, but if the AMA represents so few physicians total, why doesn't an opposing rival national group form for the interests of a majority of physicians and create a more powerful and better financed lobby?
I mean if the AMA turned its back on a majority of physicians to the point that it represents ~10%, and that remaining ~90% feels the AMA doesn't represent them all for similar reasons, the remaining ~90% could form a lobby that would financially crush the AMA. The sheer quantity of physicians would create a larger potential pool of membership dues that could buy the best lobbyists. It could shove the AMA out of power and influence enough legislators to make real favorable policies for physicians, patients, and health care in general.
From my understanding, it appears a lot of organizations are not directly opposed to the AMA but operate counter to their official policies. The problem is the AMA's opponents are fragmented and aren't able to cooperatively buy influence. Please correct my misconceptions where they exist because these types of discussions really interest me.