I am having the feeling that since 'recently' in the vague sense of the word there has been an upsurge in questions on CV whereas the number of people who can give qualified answers (to sometimes very specialized question, esp. from the field of machine learning) has stagnated.

It is a very subjective impression that perhaps is related to recent interest and MOOCs on 'data science' and machine learning. I am wondering if anybody else had this experience.