I agree. They had to know they'd confuse and alienate people by changing the name of the service _and_ creating an whole new website for people to figure out. But it does allow them to extract the highest value should they sell it off later (and they will).
With plans to sell there was only two things that would have been even more bone-headed than what they did:
:a => "Sell it as Netflix DVD (or something like that) and have two companies named Netflix running around."
:b => "Sell it and force the acquiring company to change the name, in which case they would have to accept a huge discount on the value of the business."