I think the best solution is to open both the SD card slot and the USB ports for executables. Pretty much everything gets cracked anyway, so instead of keeping out the piracy, Nintendo is inconveniencing the honest customer by this limitation.
I think far more damaging than piracy would be to give the impression that the Wii is incomplete by introducing a proprietary only option. That could make future purchaser decisions more complicated (a la X-mote...)







