Oh dear! Regarding that article, and as someone who worked professionally getting California teachers credentialled, I just have to tell you: it's hooey! The so-called "teacher shortages" have NEVER existed. I've personally addressed this matter with district recruiters who have told me these "alarms" are released periodically to increase the QUALITY of the prospective-hire pool. Not necessarily a bad thing of course, but markedly different from a de facto shortage. When I left the field, teachers were leaving the profession having never taught a single paid day.
Of course in some exceptionally rural areas you could still get in pretty easily -- in fact rural areas are the only ones still issuing emergency credentials, but this is the last year for that in California.