rabidrabbit said:1) I don't think you can.
2) 2 disc "Special Editions" are the norm with DVD's. The single disc editions have usually very little extra content. There's no reason for HD-DVD and Blu-ray discs not to go the same path. In addition, there's the possibility of getting the extra (streaming?) content from the internet connection that's buit in.
1. You're right. 25gb on Mpeg2 is not good enough. While it might be ok on some titles, the longer and heavy action packed titles will suffer. Mpeg2 is at it's end of development. If it wasn't for royalties, Sony would be using something else. Also, the 50GB is pretty much out the window if they stick with Mpeg2. At this point the format is not actually superior, just more bloated.
2. If the BluRay camp starts releasing 2 discs, they'll simply look foolish having bragged endlessly about disc space advantage. Let's not forget that if WB released a movie using VC1 on both formats (they will soon), HD DVD still gives them 5GB to play with. 5GB is quite a lot considering the extra's are only in 480i/p and thus they could a ton of extras onto HD DVD disc where as the Blu Ray media only gets the movie. To me, extra's are a waste anyway. I rather see the space being used for better video/audio, if possilbe. If they're maxed out on video/audio quality and still have space left, sure tack on the extras but don't let content suffer for extras!
Sony and the BD camp will start releasing BD demo's using Mpeg2 at maximum bit rates to show what it can do if all the stars line up right. Let's hope that we as consumers actually smarten up and stop buying into the BS. I simply refuse to watch HD DVD or Blu Ray demo discs or even discuss them. It's the equivalent of buying an Ati or Nvidia card based off their tech demos and ignoring real world performance.