It needs a hard drive. YOU HEAR ME NINTENDO!?
It'll help games and the Wii start up faster, and developers will benefit from a hard drive.
But stupid Nintendo are obsessed with pleasing the crappy casual gamers, and since most casual gamer people can't tell a hard drive from a brick (meaning they won't know how to use it), Nintendo will probably take the easy way and not release it.
I may be being harsh but that's how it works most of the time with Nintendo.