So in a couple of years when there are no "iconic" bands still out there plying there trade who will take the Headliner slots ? By the very use of the word Headliner it infers that the band/act is above the mainstream, and have reached a level that even if your not a fan of the band/act you would watch them because it's an event , that crowd at GnR didnt really care that Axl can't sing anymore, it was a chance to see an iconic band in the flesh, Slash with a Gibson slung low against a dark sky with his customary hat, is an iconic image, who out of the new generation can match that ?