Good points.

On vinyl sales decreasing....

Newspaper circulation is also decreasing. Titles like the times see a drop year on year. They shrank the paper to make it easier for people to take on the tubes & buses, but circualtion kept dropping. Meanwhile more and more people started using the times website for free.
People like reading the times, they just didn't necessarily want it in print. If you combined online readership with print readership the actual readership base of the newspaper is growing. Same can be said about many other newspapers and magazines.

Its also the reason that the likes of channel 4 now run E4, More 4, Film 4, Channel 4 films etc.
Channel 4 alone didn't cut it and was losing market share, but by creating new channels they were able to grow their base as a whole.

Its just business models changing. People still love music, and are still happy to pay for it. But they want it in different formats through dfferent means.
Artists and djs need to redefine what they do and figure out how they are going to get paid for it. Nowadays it seems you need a fair few strings to your bow to make a good living from music.

Its pretty harsh though. There seems to be a glut of money in music for a select few, and comparatively little for the rest.