No, we don't have to have any "what is folk" *debate*. But it stands to reason that *you*, Charley, defined folk in some particular way (or, have something in mind when you refer to folk). I, making a guess about what you might have in mind, suggest that you may be looking in the wrong place OR have something in mind that simply not what other generations would have much reason to take an interest in. I don't see many youngsters into 1920s hot jazz or 1950s doo wop, either, nor do I see many old people at hardcore punk shows.

This can be simplified, without "defining" folk per se, by just stating more specifically what style and era of music you have in mind. A general sense, not an absolute definition, is sufficient.