Additionally, ISPs are going to be playing more of a policing roll so people who might turn to 'pirate' streaming sites are going to be finding access to those being increasingly limited until they are completely gone as well.
I'm afraid you're right. Not the ISPs want that either, but that's where things are headed. With users losing more and more control over their own computers (DRM, "trusted" computing, etc) piracy may get increasingly more difficult with time anyway