Your comment shows the real divide on unionization and its not about someone's political ideology, its fundamentally about how they view the profession. If like you said programmers should unionize before the army of $12/hour programmers arrives then what you are claiming is that software development could be done by someone who was trained and willing to accept $12 per hour. Essentially you are making the claim they are a common laborer much like a construction worker or delivery driver ( both of whom make more then $12/ hour ). If however you view software development as a profession requiring intelligence and a deep understanding of the subject matter then you don't care about the $12/hour laborers because they will never be able to replicate the work of a qualified professional.

The people who don't want a union aren't resisting it because they want to live in some libertarian wet dream, they are resisting it because they see their profession as something that can't be reduced to common labor and they don't see a labor union as able to provide any benefits, as indeed they don't when you are dealing with a profession. The push to get people to unionize is not about workers rights its about putting technology professionals in the place business owners want them in. No one likes the idea that software is eating the world and there is a limited group of people , who are not the traditional power brokers, who are very well positioned to capitalize on that. They would much rather that software development become a commodity so they can continue their model of capital vs labor.