This is an interesting topic. You mentioned loss in revenues, but aren't they just replaced? For the telecom, it was replaced by the higher internet and mobile data revenue. Back then, internet revenue was low, or maybe almost non existent. Cellular network data wasn't even a thing.
For music, and CDs, aren't they just replaced by the Ad revenue or Spotify, and premium subscriptions?
For the film, isn't it just replaced by SD card sales?
Aren't these the deflationary effects of technology that you usually say? The revenue in the old technology is going down since it is replaced by new technology. It isn't a 1:1 replacement in amount, but isn't that expected?