Nothing to do with piracy
But, once again, let’s look at what really happened here. The key reason why the sales fell over that time was because as most people shifted online, the studios fought as hard as possible to keep movies from being sold online. Instead, they focused on a ridiculous, years-long fight over which would be the new physical disc standard: HD-DVD or Blu-ray. That fight is what killed sales more than anything else. People didn’t want to buy because they didn’t want to commit to a standard that only had some movies, and which might go away, leaving people stranded. By the time Blu-ray finally won, there was enough bandwidth that people just wanted their movies online… but Hollywood had no interest in delivering it. When Netflix finally was able to start offering some movies online, the massive success of that setup caused Hollywood to freak out, and spend the next few years trying to either limit Netflix (and any competitors) or jack up the prices on Netflix to make it hard for Netflix to make money without raising its own prices.
So, sorry, but the problems Hollywood has with home theater revenue? That’s got nothing to do with piracy.