Streaming services are nice, but I haven't yet found one that contains the complete discography that is available through torrents and other means. What's worse, what's available changes often so songs that are available now may not be available next week. In other words, streaming services provide a service, but they are far from replacing other means. If a service popped up that provided streaming of all the music I wanted to listen to 100% of the time, then it might be worth paying for. Another use case is mixing songs which usually requires local copies. Basically, all streaming services are deficient in some way so it shouldn't be any surprise that piracy continues.