I think Rock hasn't died. It's just that the vein is tapped out. Everything that could be said was said over the 35 years or so that it was the number one expression of the experience of youth in western industrialized societies.
There's a British rocker named Steven Wilson who - IMHO - creates music in an idiom similar to that of The Who. Have you ever heard of him? A lot of his music is available on YouTube.
He's a successful musician in his own right, but he's not very influential because he's just too late on the scene with what he does.
No one has really figured out where the "thing" that Rock expressed goes next.
Personally, I think that there's a lot of untapped potential in the struggle against Islam, a force that enslaves hundreds of millions of people all over the world, and which is attempting to put the collar of slavery around the neck of the entire human race.
Only problem is, such music would place a bull's eye on the forehead of everyone who was involved in producing it.
Steven Wilson is awesome - but people today lack the level of sophistication required to comprehend and appreciate his music. As you indicated, he appeared on the scene twenty years too late.