Do you get to a point where you can say you have exhausted all the items in English teaching?

It may be possible

Never! I would suggest that it is impossible, if in your own mind you think that you have exhausted the "English Language" it is more than likely due to your own limitations, I mean that as a generalisation and not to you personally!! 

I find my pupils taking public examinations when l am not yet satisfied l have done enough.I am surprised they perform well though,English language teaching is so diverse and intriguing.