Rock music has had nearly a 60 year run. That's not bad. Will the world come to an end if no more rock music gets produced?
I think the problem you are wrestling with is that of superfluity, of too much of everything. That has been gathering momentum for about 3 or 4 centuries. There have been various futile efforts to 'stop' it: the Battle of the Ancients and Moderns; Wordsworth's Preface to Lyrical Ballads; Matthew Arnold's attempt to mark off the best that has been thought and felt, coming up to a contemporary poet of my acquaintance saying that the only modernists who he thought were much good were Mina Loy & Elizabeth Bishop. No Yeats. No Frost. No Pound. No Stevens to read.
Capitalism is unique among social systems in creating endless & more or less uncontrollable change (and in making the majority of people thin that is a good thing). Newspapers, popular music, best sellers, thick ad-rich magazines had a nice run of nearly a couple cneturies. I imagine business enterprises will go on figuring out ways to make profits under the new conditions and people will learn to live under them. So it goes.
Carrol