dvd had the following drawbacks:
-disc can get scratched
-backup discs can only run on some wii's, and even then only @ 3x speed (original wii discs play @ 6x speed, and usb-loaders are even faster!!!)
-u actually have to get up to change the disc instead of having ALL your games in the palm of your hand (on a HDD)
probably even more reasons, but that's enough anyways