The part about the law being vague could very well be upheld.
That it discriminates against an economic class, that's a relatively new area to be explored, since the intent of the law was to regulate the behavior of a class of people, for which there is not yet much law providing special protection. If the courts make that breakthrough, it could follow that many other laws and regulations could be challenged that control behavior in order to make the wealthy feel more comfortable about their surroundings. E.G. building codes discriminate against the poor by making housing more costly.
