The pop music of the present will become the "traditional" music of the future. That's how it's always been. It is slightly amusing when people who embrace traditional and folk music complain about the "sameness" of whatever music it is that they don't like. As Dick Greenhaus pointed out above musical genres are "genres" because they share a lot of common elements. Nine times out of ten, the things that the don't share are borrowed from other musical genres.

Bottom line is the reason that genres exist is because certain people, in a certain place, at a certain time, happen to like a particular rhythm, coupled with a particular sort of phrasing, following a small variety of melodies, with lyrics that tell stories that reflect the ideas and values of their place and time. Musicians, smart people that they are, endeavor to give em what they want.

Another time, another place, another kind of music.