#3 has been brought up by a lot of tempers, and both me and Foxi4 have again and again explained why it will never be possible. 3DS lacks the means to stream gameplay to Wii U, and Wii U lacks the means to have a high speed low latency connection necessary for a cartridge player. And no, USB ain't enough for this type of connection.
Both are hardware limitation that can only be overcome by a completely new models.
Both are hardware limitation that can only be overcome by a completely new models.