We will be engaged in the same cat-and-mouse game forever, with the pirates largely winning.
the cat and mouse game is never about totally stopping it. it's about making it hard enough that the "average" person won't bother trying it.
napster was the first to make it truly easy to grab anything and everything so they had no choice but to go after them with all guns blazing. not that you couldn't get it all before other places, but just that it was so easy for anyone with an internet connection to install it and download as much as they wanted.
more modern options like the pirate bay and such were also hit hard due to the same simplicity of use.
the first place to get it all (well before napster) is still the same place you can go to get anything and everything to this day. it's just not easy enough or well known enough for the studios to spend the money trying to stop it. but let someone create an indexing/downloading program for that small out of the way place on the interwebs, and they'll come gunning for that as well.
(note: i did purposely leave out what i am refering to, if you don't know what it is, then good for you!!! if you do know, then shame shame SHAME on you!!!)