well with more storage space on a disc means you can put more stuff in it like special features, deleted scenes, commentaries, etc. I good example of this is the Lord of the Rings Complete Edition. Any one seen it? Its like 10lbs, i don't remember how many dics it has but it was insane. Now imagine all that in one or two discs. Easy right. Star wars, DBZ, or eventually hopefully, pokemon episodes could be jammed into a blu-ray dics instead of a ton of dvds