Older music fans and casual music fans I’d imagine. I know my dad is the only person I know who buys them in any significant numbers.
I’m not fully willing to commit to steaming on its own over the ownership of physical media, and have serious concerns over artist remuneration, but with the rise of hi res streaming and more and more big artists calling out the likes of Spotify it is admittedly going to get there at some point. It’s going to have to go up in price pretty significantly, or have some type of limitation of plays for more casual listeners, to make it a fair system though!