Why go to the WSJ to see these forces when you can just take a look at some of the comments made on this forum? When we have forumites referring to an adjunct as "such a person" who would never be considered worth hiring full-time or even hiring at all unless it was a dire emergency, apparently it's amazing that "such a person" has the wits to read and understand an article in the WSJ (or even know what WSJ stands for)!
Hmmm...it's possible that's a response to something I posted elsewhere, in which case "such a person" was someone with no previous college-level teaching experience and without a Ph.D. (or the equivalent highest degree in the field), not adjuncts in general. The huge over-supply of Ph.D.s in the humanities has produced this situation, not disdain for adjuncts as intelligent people.
On topic, though, I agree that the WSJ is unlikely to say anything good about unions; the piece is terribly slanted.