Sure if you can find the good quality movies prelaunch, but how often are they available? Most of the time it's just not the quality you get in the cinema. People only watch those close to launch releases to know what everyone is talking about and wait until the dvd is out or the movies shows up on television to look at it with decent quality.
The problem isn't that people are torrenting the movies, it's that the cinema is too expansive and not adding enough value anymore. And I don't disagree with them. There are so many advantages for not going to the cinema. Can pause when I want, I can grab my cheap popcorn and soda, I can watch more relax don't have to worry about anyone else talking, don't have to worry about anyone sitting in front of me blocking the view.
The problem isn't torrenting, it's the cinema. As soon as they find ways to get us back in, torrenting will go down. And we can also say that DVD, blueray and streaming kills cinema, all legal but that doesn't sound that great now does it?