Yeah, I suppose you are right. The ultimate “classroom” will be an overpaid teacher in his living room texting his/her students to which they will pay even less attention than they now do in class.
The need for fully credentialed teachers will decline, with much of their former work becoming taken up by test monitors and email correspondents for students whose learning efforts are overseen mostly by parents using the best available recorded lectures and self teaching courses.
There will still be a demand for old style teachers in the remaining custodial, day care schools for delinquents and the unruly dregs of single parents who still commute to work. Otherwise, for most kids, going to school will be a special occasion, for lab work, organized sports, in person verification tests, and other activities that require personal attendance.