At this stage, having a physical medium attached to my media is a liability. I don't want to have to carry bulky CD cases or have them take space in my car.
So really they have to match the online price points of MP3s AND they have to be something I'd want to 'collect' for posterity sake. The only time I'd like a hard copy is for my all time favorite albums, so I can enjoy the tactile experience of handling collectors edition artwork. This is a good move from the record industry but really, CDs will have the same marketshare as vinyl currently does in about 10 years (apart from the developing world perhaps).