What music concepts are you talking about? Speaking from the artist-side, I have a hard time believing anything that disrupted the former model (e.g., the record label cartels, etc.) is detrimental for anyone other than the traditional (and obsolete) record labels. You don't need a gatekeeper for music. Reviews, ratings and 10 seconds on Spotify or iTunes can tell you how good or bad you think the product is. If you make or like less "popular" genres, the disruption of the music industry and the ability of artists to go direct has been a major benefit.
The story with journalism is a bit more complicated. The death (and they are dead) of traditional newspapers and magazines has certainly resulted in an overall reduction in writing quality, but less well written news today has won over arguably better written news tomorrow. Over time, things will likely shake out to the point good writing is consolidated on a few brands, with a more immediate platform.