A sneaky way of solving the teacher shortage

The Center for Teaching and Learning has released a report on the impending shortage of teachers in California schools (link to release here). And of course, there are several ways to address a labor shortage: better wages, better working conditions, and so on. But one option I hadn't considered: lowering standards and letting less-qualified people into the workforce, which is what The Education Wonks say has happened in California in the past.

In the comments section of their post on the subject, they write:

Have you ever noticed that when the supply of licensed teachers starts
becoming tight (resulting in rising salaries) the state loosens licensure
requirements? The job market is then flooded with people who don't have their
licenses, (emergency credentials, pre-interns, interns, etc.) all of which tends
to depress wages.

I'm supportive of the idea that only fully licensed folks should be working
in the classroom without the direct supervision of an administrator or
highly-skilled teacher.

To use a comparison involving other skilled occupations: When's the last
time you've ever heard of a doctor, dentist, electrician, plumber, or beautician
having less than full certification yet working without supervision?