Why can't US music industry produce big names who appeared in "60's to 90's"?

Think about the time between 60's and 90's, Beatles, Elvis, Abba, Elton John, Michael Jackson, Madonna, Aerosmith were so much influential and had firm place in millions of music lovers for long time. In todays US music, we see more glamor, body language, expressions of lust rather than pure theme and talent. some come up suddenly with potent, and vanish quickly. No one can manage to get even close to what those predecessors had done.