To assure you I'm not trolling... take a look at this discussion before replying: http://www.escapistmagazine.com/news/view/114391-Valves-Gabe...
I never understood this thing about "easily copy-able" being a reason to strip a business of their distribution rights. Yes, the actual string of 1's and 0's is easy to copy. But physically making a 60 minute episode of Game of Thrones is not so easy. I think the work they have put into making their product has earned them the right to control the distribution of their product just as much as any other business. If you don't like the way HBO distributes Game of Thrones... you don't go pirate it... you go film it yourself (although I suspect that would not be allowed either).
HBO Go puts the technical infrastructure in place to eliminate the cable companies as customers if this ever changes, so they have some chance of surviving the likely collapse of the cable industry