I did not think that Lair was going to be a must have for the PS3 but god dang it looks gorgeous. The battles really look fast-paced and with so much stuff going on at once it could really get your heart pumping. If it plays as well as they said, I can not wait to get my hands on it.
In my opinion the mp3 and cd comparison is invalid. Mp3's are small freaking files that can be downloaded in no time and on top of that you can burn that to a cd. A hard copy still exist and you save gas money. The only people who buy the cd's just want the official art and the etc. ((Which I do.))
DD will only be an alternative to Bluray for now. I really think a lot of people prefer to have a hard copy of something and internet speeds are, as most people have said, just not up to par ...