Teachers' unions protect the employment rights of teachers.
Teachers' unions do not protect improving the learning performance of children.
To your point, then, teachers' unions represent an "empty chair" in defending and protecting the future of America, and the results are and have been evident for decades now.
Exposure and ridicule of the absurdity of teachers' unions as a means of improving education in America may be a useful tool, as you suggest.
A good teacher knows that "one size does not fit all"; that big government solutions stifle the necessary innovations in every class-room, necessary to do the best for the children in that classroom; that building gigantic educational bureaucracies, Federal, State & local, squander money, while making it virtually impossible for the good teacher to properly address the individual child's needs & aptitudes. But, of course, all of that is obvious to anyone who really wants to accomplish anything worthwhile--as directly opposed to those wishing to appear to be "doing something."
William Flax