Blu-Ray, most games don't use full DVD9, most are about 5mb, and you can put them on a dvd5, if you get rid of the dash updates. the added space of blu-ray is only good for movie(s). i dont remeber 4/5 cds stopping people from buying the playstation. 2 dvd9's in more than enough room for games.
10 years come, If we're playing a ps3 in then sony is screwed, the xbox 3 will be out by then.