I think getting students to work together to show their displeasure with the way things are going is very important, but doing so at a level that the college and university administrations will pay attention is difficult. Sure, we could boycott the bookstore because prices are too high, and we could even conceivably boycott low-paying on-campus employment in favor off better jobs off-campus (only in some places though), but we're STILL paying tuition.
I'm not sure about that guy's numbers, especially concerning the number of jobs that would be created vs. the amount of money it would cost. I like the theory though--only put the people who are qualified in teaching positions and you force people to hire those people who are qualified and force those people who aren't qualified to get qualified. At the high school level I think it would be even better (but for a different reason, that being less about job creation and more about overall "educatedness" of the students). But I digress.
I don't know if a national organization per se could solve this problem, because I don't think everyone could agree on a set of precepts on which to base such an organization. A loose collective of some sort might be better, one that is made up of students at many schools that trades long-term goals, tactics, and results (precedents, if you will) in order to give everyone the tools they need without dictating for what each group would be fighting.
I would start somewhere short of leading a boycott against a specific university as a whole and go with symbolic acts first--a sit-in for true representation by student senators, a series of well-researched articles in the school paper on average salaries and work hours of full-time students at a particular school, the percentage of classes that are taught by underqualified instructors, why the athletic coaches are paid so much, that sort of thing. After that, hopefully you'd find some more imaginative people than I for many more things that are incendiary, nonviolent, but effective.
At the same time, more outreach to the local communities is warranted by many universities. Grand Forks historically dislikes UND for some reason. Right now is a good time for UND/NDSU students in particular because of the flood, and we should be capitalizing on that good will in order to find more people willing to employ students, work around class schedules, and support student organizations (I mention the last because the Cycling Club is still looking for sponsors).
I think change is possible, but it needs to be from the ground up--start with departments, move to school, and then the university. I've actually not thought of starting with the departments before; I think it might be very effective for students in every major to ask what benefit they are getting for the money that could be spent on real instructors rather than graduate students (graduate students SHOULD gain teaching experience wherever they can, but this should be part of the curriculum, not something they're income depends on).
Really, that's all. I'm all over the place today.