Interesting, but why did Europe get the NES design if the size was to accommodate the American's tastes in bigness?
In a way, I thought that the NES cartridges were wasting material since it really didn't need to be that big (even if it were half the size it was I think it would have sold well). So Nintendo in effect wasted money somewhat with that strategy.
I agree that SEGA's Plastic Cases is probably the best thing the Video Game Industry did, as not only did it show people that games can be treated just like Music and Videos, but it also provided long term protection and fewer lawsuits as well (since warranty is pretty paramount when it comes to customers stupidity to take care of their purchases, because if they used the Cardboard Box as evidence that the manufacturer didn't protect their games, they'd most likely be sued), so SEGA were very smart to go with Plastic Cases, as their counter argument would be "Well, the case IS there to protect your games, so it's your fault!)
I do think that Nintendo's Mini DVD format for the Gamecube was a smart idea, however...it did limit the memory of their games...