Teachers should prepare the student for the student’s future, not for the teacher’s past.
Most teachers rarely talk about the important topic of the future of their fields. They say "No one can know the future". But the difficulty of knowing the future does not absolve the teacher from seriously trying to help the student to be ready for it when it comes.
It's worth pondering since one's projection into the future is apt to be somewhat personal and not universally accepted. Therefore, as a student what do we want to learn more, impersonal surveys or personal story? And what do we need to learn more?
Also, can this rule be applied to other fields, like writers, designers, or even artists?