Just wanted to add this to the discussion. Bluray at 2x speed isn't going to be that much slower than a DVD at 12x speeds. The reason is that the Bluray drive is a CLV (constant linear velocity) drive meaning that it reads at a constant 9 MB/s. The drive in the XBox360 is a CAV (constant angular velocity) drive meaning that it's PEAK read speed is 16 MB/s. In addition, read speed for DVD9 discs (dual layer) are slower than that for DVD5 (single layer). And I believe that most XBox360 games are on DVD9. All in all, overall read speeds are not going to be too different. I think the bigger factor is that DVD has a shorter seek time. This means that getting data from various parts of the disc is not that big a deal. On a Bluray it would be, and that's why so many developers are repeating data. It would just add to the load time if you had to look for texture data from level 1 that you need for level 5. Instead, just repeat the textures that you need to keep it together with the other data for level 5. I mean, it's not like Bluray is hurting for disc space for the majority of games coming out.
As for MGS4 taking up a whole 50 GB, I'm not sure what to think. I can't really think of any reason why they would NEED 50 GB outside of prerendered videos. Everything else can be compressed, and I highly doubt the game is going to be so long that the 50 GB was required, even with compression and ingame cutscenes.
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