Buying physical music will never go away. I have kept all my albums I've burnt onto my iPhone. Why? If my hard drive goes t!ts up, I have a backup.
Streaming as well. I hate streaming. When you lose signal out and about, no music. When you lose wi-fi connection, no music. When you can't afford £9.99 every month, no music.
Burning all my albums onto my iPhone negates all these issues. It's my music, that I own and can listen to no matter where I am.