idk about that.  during the 90s 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 90s 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.