to "hack" the Wii you must find a way to let the console load the images the way they are put on a normal DVD.
If you take some time and search the web you might find, that the information on Wii-Discs is saved differently than on ordinary DVDS. To load the data, the Wii-Drive supports some special commands. These commands are not available if you put in a non-Wii-Media (aka. ordinary DVD).
Actual Mods allow the drive to perform these special commands even if a non-Wii-Media is inserted and hence play the game.
Of course, this is a small break down of how it is supposed to work.
Now if you want to perform all this through the USB you need some things:
- The USB Ports are active and receive-ready
- you can and are allowed to alter the console configuration from the USB-Client (if you plug in some USB-Device it is a client an the PC, Hub or in this case the Wii is the Host)
[Btw: USB uses polling, this means the Master/Host asks the client if there is something to say]
or
- a completely new approach to hacking the wii.
I am optimist and would not say it is impossible, but I real don't think this is gonna happen, even IF it is technically possible.