Brings to mind the perpetual shortage of truck drivers. And yet companies always seem to find people. How? Simple, lowering standards, immigration, and technology (many trucks are automatics).

Figure the same will happen with teaching. Already is. The last point about tech is one many teachers don't think much of in regard to qualifications. Virtual learning, which many teachers and even unions often advocated for, could also lead to less credentialed teachers replaced by teacher aides acting primarily as monitors watching over the students as they're instructed remotely.

One remote teacher could potentially teach several classrooms at once. Even for instances they can't, they could be located anywhere and hired as a contractor with minimal benefits. Many ways I see could play out.

I don't put much faith in school districts / taxpayers ponying up the considerable extra funds to do what some are suggesting. Instead seeking more shortcuts. They'll be exceptions of course, but in many places, the more well-to-do parents will increasingly seek out chartered schools, parochial schools, and private schools. Leaving the remainder, often including students with special needs, to the public schools to deal at the detriment of teachers, students, and the community.

In short, technology could allow schools to reduce their accredited teaching staff considerably. Combine that with lowered standards and immigration, the shortage of teachers will be mitigated. Not solved, but handled good enough to keep schools running.