idk about that  during the s most bands pussed out and started selling softer albums so they could sell more  Sure every once in a while youll hear a new hard rock song from some random band on the radio but since the early s hard rock has really decreased in popularity  For example a radio station that is where im from used to only play modern hard rock but they had so little to play they had to switch to hard rock from the past few decades  idk what bands he thinks evolved from hard rock