> what would be the use of teaching the subject in the first place, even to enthusiastic students?
This is something which you should always ask yourself in a class. What use is this class?
Usually the "why" is: "nobody would take this class unless we forced them to, and the English department would starve to death without forced pre-requisites"
> Even if you reach one kid, you will have achieved your intended result
If you reach 1 kid in a class of 30 you have objectively failed