1080P fmv content will take up a MASS amout of space for sure, but this is not necessarily a requirement, but something the PS3 can do better.
Animation and Physics WILL NOT take up very much more space, get real... it's ALL code it's all text based sorry.
Audio again I don't think will take up that much more space, of course I know the Audio is MP3, not text based, I didn't say and would never say that.
If you want to back up all your arguments provide me with links with proper sources, but at least grab the section of text you are talking about rather than make me read the whole thing, that is completely useless IMO, grab the captioned segments that you think you are using.
A good point of references is Naughty Dog dude's blog and what he talks about with storage space on PS3. Adventure games might take up a few discs i'm sure, RPG's probably a definite but changing discs in games is common... how many discs was FFIX again? 3 wasn't it? Blue Dragon? No big deal it's not that important.
The Wii's controller is the most important part of this generation.
Essay Pro