I remember when the Nintendo channel on the wii was out, you could try out ds game demos... this worked by the wii hosting the demo via ds download and in the ds download, you would load the ds download and play the game demo... maybe if a hack was discovered we could play full games? The wii can also connect to the 3ds using the mii channel to transfer miis. These show that the wii can connect to the 3ds n both 3ds mode and ds mode. Perhaps we could somehow host roms this way to not just the 3ds, but all DS using the ds download?