Honestly, I think both CDs and DVDs are moving toward being completely digital. Why would companies spend the money and effort to manufacture and distribute plastic disks when they can make substantially higher profits producing digital files that you can download on demand and store on a flash drive? I personally like having the physical disks themselves, but in the future, when every single song, movie, and tv show will be available to download whenever you want, from wherever you are, in a higher quality/definition than the version that you have, for what will probably be a much lower price than what we are now paying, what's the point, really?
That's part of why I don't think the HD-DVD/Blu Ray debate is really that important. I think that, within 5 years or so, modern technology will make that stuff a thing of the past.