So, here we have teachers unions all across the country proving that not only are teachers non-essential - as they don't want to go back to classes - but they are also mostly unnecessary. With the use of online teaching, a smaller number of teachers are needed. They only need to pre-record a lesson a day and spend some time online answering questions, so fewer teachers are needed to cover more students. Who would have thought that teachers unions are showing the way to end teaching careers.