The reason why for me, someone with a netflix and amazon prime account in Germany, bittorrent is neither dead nor declining (for movies and TV shows):
a) Being on time. If you want to take part in the online discussion about tv shows, you have to watch them on time. For a ton of shows I can't even buy episodes on the day they come out. Torrenting is still the far superior choice.
b) Languages. Yes netflix, I know that I live in Germany. That does not mean that I don't want to have the option of watching anime in Japanese with English subtitles. And Amazon, it's great that I found out you are now showing advertisements before every episode, but it's also in German. While everything else on amazon.de is in English for me.
c) Quality. I don't care that your algorithm thinks my network is not fast enough for HD. Just let me tell it that it's wrong. Or I could torrent and download something in actual HD within just a few minutes.
The worst thing is that all of those are completely artificial. There is no technological reason for any of those problems to exist. And ignoring if I want to or not, in most cases I don't even have the option of throwing absurd amounts of money at them to make them go away. Because of greed, laziness and/or stupidity, torrenting is still the superior option in most cases. For me.
PS: Mostly thanks to Bandcamp.com music torrenting is completely dead for me.