1. Sony is not a lead designer of Blu-ray tech. It was created by someone else and then Sony and Pioneer took (not negative) the work and created prototypes
2. Digital versus Disc is not a format war, they are just mediums
You're right, it does make sense to go digital. Because of the growing size of content (and it will continue to grow), the research and costs involved in developing new physical mediums, just isn't worth it anymore, beyond a "hey, look what we can do" scenario.
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