The world is not divided into black-hat pirates and white-hat consumers. Many pirates also buy CDs, DVDs and go to the cinema, and I think most customers copy music and videos. If the big media companies were to prosecute pirates en-masses, they would be killing their own business. Any broad prosecution of pirates or destruction of piracy infrastructure would (or should) massively backfire on the media companies.
If they want to keep people coming to the cinema, they need to improve the cinema experience beyond what can be achieved at home, as with the recent 3d movies Avatar, etc.