Stephen B. Pacetti has it backwards. It would not take a crystal ball to see the potential consequences, it just takes a knowledge of history. I am old enough to remember a time when stores refused to serve racial minorities, ethnic minorities, Catholics/Protestants/Jews/etc., immigrants (and their descendants), and other such groups. It is easy to brush off a single establishment doing so, but it was not uncommon for, say, every bakery in town to refuse service to such people. And in every nearby town as well. Laws and the Courts put an end to that for most groups, until recently. The consequences of bringing it back are known and well documented.