I don't see a massive problem, I have a ton of Wii game saves, along with Virtual Console titles and the saves from that.
I also have every channel including the once free Internet Channel, I even still have the Metroid Prime Channel. And Mario Kart Wii channel.
And I have about 800 blocks left.
But, I don't think 3rd party could make one, if they did it'd have to go in the SD card slot and hold more then 20-30gbs just to please everyone.
And Nintendo's been talking about making one, just wait, they said maybe we'll see something at e3.

I own all of lastgen systems as of October 2008. (Finally got a Dreamcast)
I own every currentgen system except PS3.







