Windows Media Center: Cablecard support is great but what about 5C?

While we all sit patiently waiting for Windows Media Center CableCARD support I started to wonder. FireWire has been available on Cable boxes for almost 2 years but we still can't stream HD to our Xbox 360 since most of the channels are protected with 5C. This of course also prevents us from enjoying the content in HD on our HTPCs because of the lack of 5C support. Some people say that 5C will never be supported by PCs, but the original 5C presentation actually has a picture of a PC connected to the 1394 network. So all of this this lead me to the question: why hasn't Microsoft added 5C support to Windows Media Center Edition?

Is it simply because CableCARD is a better solution, so why bother? Wouldn't it be cool if WMCE could participate in a HAVi or HANA network, turning other HANA TVs into Media Center connectors? Or support backing up to DVHS? Maybe they have tried but were turned down. Either way, I think it would be a great option, especially considering it wouldn't require a special capture card in the computer, just a 5C supported 1394 port.