Well, no, that's not how laws like this work. Of course people in these states can just install the software and it is very likely nothing more will come from that unless some politico in one of these states decides she has a beef against the company, group or person which distributes the software. When that happens she'll have this law at hand to whack them with because the knowingly violated state law so they need to be dealt with, won't anyone think of the children?.