"Give me one good reason why a 8GB disc is a huge neccessity."
Exactly- on top of the fact no game this generation has even approached 8 gigabytes, with the increase in graphical quality, less and less FMV is going to be used, which takes up most of the space on those gigantic games, and the little FMV that is used will be compressed with technology like DivX (haven't I said this already?). I actually see game size going down fairly soon, although a disc bigger than 1.5 gigs would be optimal, but one that's 8 gigs is absurd.