Ask for 9GB, not 8. 9GB could do wonderful things for backwards-compatability on the 360; dump the entire disc into RAM, use the remaining gig for the actual memory usage of the game. Think of the load times!
8 gig is a lot. I think it would still be a lot in 2013, but by the end of that console's life, it'd probably be the norm. I get what he's driving at. That said, I dislike idea that's become prevalent of solving problems by throwing tech at it; while it'd be wrong to accuse Crytek of that, there's bound to be a bunch of companies who use the extra leeway not to make better games but instead to get away with writing sloppier code.
Not, I should add, that that's a reason not to do it. Just something that irks me.