Actor Jack Black recently joined a long line of prognosticators shaking the death rattle for rock 'n' roll. However, Foo Fighter Dave Grohl says, "There will always be rock 'n' roll." If saltine crackers are any way of judging, I'm with Grohl on this.
Grunge didn't kill pop metal, it merely succeeded it as the genre of choice as part of a logical progression. To understand the emergence of alt-rock, we need to examine why the tide turned against a wave of music that had once been so popular.