someone thinks so https://news.elearninginside.com/can-online-learning-replace-substitute-teachers-a-few-school-districts-are-testing-the-concept/
It's only a matter of time. Our school district has distributed chrome books to all students and has replaced snow days with prepared content from the faculty. It's only a small cognitive leap away from allowing a teacher to take a few days, deliver the content the same way and cut the substitute costs.