An additional possibility that occurs to me is that the movie studios' well-publicized dislike and fear of the streaming business is hurting the physical DVD business. Netflix has had to accept some pretty bad terms from studios, like delaying their availability of new releases, in part because studios see Netflix as a long-term threat. Quickster, on the other hand, should be able to build better relationships with studios precisely because they're not a threat to the studios' long-term dominance.

Basically, it's true that this is not the most customer-friendly move in the short-term, but the movie studios' strategy in the medium-term was to kill Netflix. "Continue to grow in the same direction" was not an option because the studios hated it, and this way both pieces of Netflix have at least a chance to survive.